diff --git a/bind/genjava.go b/bind/genjava.go
index d6d7f26..633f9aa 100644
--- a/bind/genjava.go
+++ b/bind/genjava.go
@@ -231,7 +231,7 @@ func (g *JavaGen) GenClass(idx int) error {
 func (g *JavaGen) genProxyImpl(name string) {
 	g.Printf("private final int refnum;\n\n")
 	g.Printf("@Override public final int incRefnum() {\n")
-	g.Printf("      Seq.incGoRef(refnum);\n")
+	g.Printf("      Seq.incGoRef(refnum, this);\n")
 	g.Printf("      return refnum;\n")
 	g.Printf("}\n\n")
 }
diff --git a/bind/java/Seq.java b/bind/java/Seq.java
index 8d0a8b0..cb77dd0 100644
--- a/bind/java/Seq.java
+++ b/bind/java/Seq.java
@@ -98,7 +98,10 @@ public class Seq {
 	}
 
 	// Increment the Go reference count before sending over a refnum.
-	public static native void incGoRef(int refnum);
+	// The ref parameter is only used to make sure the referenced
+	// object is not garbage collected before Go increments the
+	// count. It's the equivalent of Go's runtime.KeepAlive.
+	public static native void incGoRef(int refnum, GoObject ref);
 
 	// Informs the Go ref tracker that Java is done with this refnum.
 	static native void destroyRef(int refnum);
diff --git a/bind/java/seq_android.c.support b/bind/java/seq_android.c.support
index c4fafc2..77ec5f4 100644
--- a/bind/java/seq_android.c.support
+++ b/bind/java/seq_android.c.support
@@ -350,7 +350,7 @@ Java_go_Seq_destroyRef(JNIEnv *env, jclass clazz, jint refnum) {
 }
 
 JNIEXPORT void JNICALL
-Java_go_Seq_incGoRef(JNIEnv *env, jclass clazz, jint refnum) {
+Java_go_Seq_incGoRef(JNIEnv *env, jclass clazz, jint refnum, jobject ref) {
 	IncGoRef(refnum);
 }
 
diff --git a/bind/testdata/classes.java.golden b/bind/testdata/classes.java.golden
index 200a317..44c6ca9 100644
--- a/bind/testdata/classes.java.golden
+++ b/bind/testdata/classes.java.golden
@@ -12,7 +12,7 @@ public final class Future implements Seq.GoObject, java.util.concurrent.Future {
     private final int refnum;
     
     @Override public final int incRefnum() {
-          Seq.incGoRef(refnum);
+          Seq.incGoRef(refnum, this);
           return refnum;
     }
     
@@ -46,7 +46,7 @@ public final class InputStream extends java.io.InputStream implements Seq.GoObje
     private final int refnum;
     
     @Override public final int incRefnum() {
-          Seq.incGoRef(refnum);
+          Seq.incGoRef(refnum, this);
           return refnum;
     }
     
@@ -78,7 +78,7 @@ public final class Object extends java.lang.Object implements Seq.GoObject {
     private final int refnum;
     
     @Override public final int incRefnum() {
-          Seq.incGoRef(refnum);
+          Seq.incGoRef(refnum, this);
           return refnum;
     }
     
@@ -107,7 +107,7 @@ public final class Runnable implements Seq.GoObject, java.lang.Runnable {
     private final int refnum;
     
     @Override public final int incRefnum() {
-          Seq.incGoRef(refnum);
+          Seq.incGoRef(refnum, this);
           return refnum;
     }
     
diff --git a/bind/testdata/doc.java.golden b/bind/testdata/doc.java.golden
index 2a94563..8a2ac77 100644
--- a/bind/testdata/doc.java.golden
+++ b/bind/testdata/doc.java.golden
@@ -15,7 +15,7 @@ public final class NoDoc implements Seq.Proxy {
     private final int refnum;
     
     @Override public final int incRefnum() {
-          Seq.incGoRef(refnum);
+          Seq.incGoRef(refnum, this);
           return refnum;
     }
     
@@ -61,7 +61,7 @@ public final class S implements Seq.Proxy {
     private final int refnum;
     
     @Override public final int incRefnum() {
-          Seq.incGoRef(refnum);
+          Seq.incGoRef(refnum, this);
           return refnum;
     }
     
@@ -194,7 +194,7 @@ public final class S2 implements Seq.Proxy {
     private final int refnum;
     
     @Override public final int incRefnum() {
-          Seq.incGoRef(refnum);
+          Seq.incGoRef(refnum, this);
           return refnum;
     }
     
@@ -267,7 +267,7 @@ public abstract class Doc {
         private final int refnum;
         
         @Override public final int incRefnum() {
-              Seq.incGoRef(refnum);
+              Seq.incGoRef(refnum, this);
               return refnum;
         }
         
diff --git a/bind/testdata/ignore.java.golden b/bind/testdata/ignore.java.golden
index 09acc5a..df327a0 100644
--- a/bind/testdata/ignore.java.golden
+++ b/bind/testdata/ignore.java.golden
@@ -12,7 +12,7 @@ public final class S implements Seq.Proxy, I {
     private final int refnum;
     
     @Override public final int incRefnum() {
-          Seq.incGoRef(refnum);
+          Seq.incGoRef(refnum, this);
           return refnum;
     }
     
@@ -90,7 +90,7 @@ public abstract class Ignore {
         private final int refnum;
         
         @Override public final int incRefnum() {
-              Seq.incGoRef(refnum);
+              Seq.incGoRef(refnum, this);
               return refnum;
         }
         
diff --git a/bind/testdata/interfaces.java.golden b/bind/testdata/interfaces.java.golden
index fece954..a25fb29 100644
--- a/bind/testdata/interfaces.java.golden
+++ b/bind/testdata/interfaces.java.golden
@@ -154,7 +154,7 @@ public abstract class Interfaces {
         private final int refnum;
         
         @Override public final int incRefnum() {
-              Seq.incGoRef(refnum);
+              Seq.incGoRef(refnum, this);
               return refnum;
         }
         
@@ -166,7 +166,7 @@ public abstract class Interfaces {
         private final int refnum;
         
         @Override public final int incRefnum() {
-              Seq.incGoRef(refnum);
+              Seq.incGoRef(refnum, this);
               return refnum;
         }
         
@@ -178,7 +178,7 @@ public abstract class Interfaces {
         private final int refnum;
         
         @Override public final int incRefnum() {
-              Seq.incGoRef(refnum);
+              Seq.incGoRef(refnum, this);
               return refnum;
         }
         
@@ -190,7 +190,7 @@ public abstract class Interfaces {
         private final int refnum;
         
         @Override public final int incRefnum() {
-              Seq.incGoRef(refnum);
+              Seq.incGoRef(refnum, this);
               return refnum;
         }
         
@@ -202,7 +202,7 @@ public abstract class Interfaces {
         private final int refnum;
         
         @Override public final int incRefnum() {
-              Seq.incGoRef(refnum);
+              Seq.incGoRef(refnum, this);
               return refnum;
         }
         
@@ -214,7 +214,7 @@ public abstract class Interfaces {
         private final int refnum;
         
         @Override public final int incRefnum() {
-              Seq.incGoRef(refnum);
+              Seq.incGoRef(refnum, this);
               return refnum;
         }
         
@@ -226,7 +226,7 @@ public abstract class Interfaces {
         private final int refnum;
         
         @Override public final int incRefnum() {
-              Seq.incGoRef(refnum);
+              Seq.incGoRef(refnum, this);
               return refnum;
         }
         
@@ -239,7 +239,7 @@ public abstract class Interfaces {
         private final int refnum;
         
         @Override public final int incRefnum() {
-              Seq.incGoRef(refnum);
+              Seq.incGoRef(refnum, this);
               return refnum;
         }
         
@@ -251,7 +251,7 @@ public abstract class Interfaces {
         private final int refnum;
         
         @Override public final int incRefnum() {
-              Seq.incGoRef(refnum);
+              Seq.incGoRef(refnum, this);
               return refnum;
         }
         
diff --git a/bind/testdata/issue10788.java.golden b/bind/testdata/issue10788.java.golden
index 82ea13e..29191c5 100644
--- a/bind/testdata/issue10788.java.golden
+++ b/bind/testdata/issue10788.java.golden
@@ -12,7 +12,7 @@ public final class TestStruct implements Seq.Proxy {
     private final int refnum;
     
     @Override public final int incRefnum() {
-          Seq.incGoRef(refnum);
+          Seq.incGoRef(refnum, this);
           return refnum;
     }
     
@@ -93,7 +93,7 @@ public abstract class Issue10788 {
         private final int refnum;
         
         @Override public final int incRefnum() {
-              Seq.incGoRef(refnum);
+              Seq.incGoRef(refnum, this);
               return refnum;
         }
         
diff --git a/bind/testdata/issue12328.java.golden b/bind/testdata/issue12328.java.golden
index 27acc7e..7b24a59 100644
--- a/bind/testdata/issue12328.java.golden
+++ b/bind/testdata/issue12328.java.golden
@@ -12,7 +12,7 @@ public final class T implements Seq.Proxy {
     private final int refnum;
     
     @Override public final int incRefnum() {
-          Seq.incGoRef(refnum);
+          Seq.incGoRef(refnum, this);
           return refnum;
     }
     
diff --git a/bind/testdata/issue12403.java.golden b/bind/testdata/issue12403.java.golden
index 231f6a3..31aef58 100644
--- a/bind/testdata/issue12403.java.golden
+++ b/bind/testdata/issue12403.java.golden
@@ -37,7 +37,7 @@ public abstract class Issue12403 {
         private final int refnum;
         
         @Override public final int incRefnum() {
-              Seq.incGoRef(refnum);
+              Seq.incGoRef(refnum, this);
               return refnum;
         }
         
diff --git a/bind/testdata/java.java.golden b/bind/testdata/java.java.golden
index c47beba..e905d43 100644
--- a/bind/testdata/java.java.golden
+++ b/bind/testdata/java.java.golden
@@ -87,7 +87,7 @@ public abstract class Java {
         private final int refnum;
         
         @Override public final int incRefnum() {
-              Seq.incGoRef(refnum);
+              Seq.incGoRef(refnum, this);
               return refnum;
         }
         
@@ -99,7 +99,7 @@ public abstract class Java {
         private final int refnum;
         
         @Override public final int incRefnum() {
-              Seq.incGoRef(refnum);
+              Seq.incGoRef(refnum, this);
               return refnum;
         }
         
@@ -111,7 +111,7 @@ public abstract class Java {
         private final int refnum;
         
         @Override public final int incRefnum() {
-              Seq.incGoRef(refnum);
+              Seq.incGoRef(refnum, this);
               return refnum;
         }
         
@@ -123,7 +123,7 @@ public abstract class Java {
         private final int refnum;
         
         @Override public final int incRefnum() {
-              Seq.incGoRef(refnum);
+              Seq.incGoRef(refnum, this);
               return refnum;
         }
         
@@ -134,7 +134,7 @@ public abstract class Java {
         private final int refnum;
         
         @Override public final int incRefnum() {
-              Seq.incGoRef(refnum);
+              Seq.incGoRef(refnum, this);
               return refnum;
         }
         
diff --git a/bind/testdata/keywords.java.golden b/bind/testdata/keywords.java.golden
index df30f41..e2c744a 100644
--- a/bind/testdata/keywords.java.golden
+++ b/bind/testdata/keywords.java.golden
@@ -90,7 +90,7 @@ public abstract class Keywords {
         private final int refnum;
         
         @Override public final int incRefnum() {
-              Seq.incGoRef(refnum);
+              Seq.incGoRef(refnum, this);
               return refnum;
         }
         
diff --git a/bind/testdata/structs.java.golden b/bind/testdata/structs.java.golden
index fad0c5f..d8a8006 100644
--- a/bind/testdata/structs.java.golden
+++ b/bind/testdata/structs.java.golden
@@ -12,7 +12,7 @@ public final class S implements Seq.Proxy {
     private final int refnum;
     
     @Override public final int incRefnum() {
-          Seq.incGoRef(refnum);
+          Seq.incGoRef(refnum, this);
           return refnum;
     }
     
@@ -75,7 +75,7 @@ public final class S2 implements Seq.Proxy, I {
     private final int refnum;
     
     @Override public final int incRefnum() {
-          Seq.incGoRef(refnum);
+          Seq.incGoRef(refnum, this);
           return refnum;
     }
     
@@ -118,7 +118,7 @@ public final class Structs_ implements Seq.Proxy, I {
     private final int refnum;
     
     @Override public final int incRefnum() {
-          Seq.incGoRef(refnum);
+          Seq.incGoRef(refnum, this);
           return refnum;
     }
     
@@ -186,7 +186,7 @@ public abstract class Structs {
         private final int refnum;
         
         @Override public final int incRefnum() {
-              Seq.incGoRef(refnum);
+              Seq.incGoRef(refnum, this);
               return refnum;
         }
         
diff --git a/bind/testdata/underscores.java.golden b/bind/testdata/underscores.java.golden
index 4fa14cd..58c64d0 100644
--- a/bind/testdata/underscores.java.golden
+++ b/bind/testdata/underscores.java.golden
@@ -12,7 +12,7 @@ public final class Underscore_struct implements Seq.Proxy {
     private final int refnum;
     
     @Override public final int incRefnum() {
-          Seq.incGoRef(refnum);
+          Seq.incGoRef(refnum, this);
           return refnum;
     }
     
diff --git a/bind/testdata/universe.java.golden b/bind/testdata/universe.java.golden
index f1578c4..e7d21c2 100644
--- a/bind/testdata/universe.java.golden
+++ b/bind/testdata/universe.java.golden
@@ -36,7 +36,7 @@ public abstract class Universe {
         private final int refnum;
         
         @Override public final int incRefnum() {
-              Seq.incGoRef(refnum);
+              Seq.incGoRef(refnum, this);
               return refnum;
         }
         
diff --git a/bind/testdata/vars.java.golden b/bind/testdata/vars.java.golden
index 7b22a1d..f92423f 100644
--- a/bind/testdata/vars.java.golden
+++ b/bind/testdata/vars.java.golden
@@ -12,7 +12,7 @@ public final class S implements Seq.Proxy, I {
     private final int refnum;
     
     @Override public final int incRefnum() {
-          Seq.incGoRef(refnum);
+          Seq.incGoRef(refnum, this);
           return refnum;
     }
     
@@ -78,7 +78,7 @@ public abstract class Vars {
         private final int refnum;
         
         @Override public final int incRefnum() {
-              Seq.incGoRef(refnum);
+              Seq.incGoRef(refnum, this);
               return refnum;
         }