diff --git a/bind/java/ClassesTest.java b/bind/java/ClassesTest.java
index 54d3f4e..6193307 100644
--- a/bind/java/ClassesTest.java
+++ b/bind/java/ClassesTest.java
@@ -73,7 +73,7 @@ public class ClassesTest extends InstrumentationTestCase {
 	public void testGoObject() {
 		Runnable r = new GoRunnable();
 		r.run();
-		assertTrue("GoRunnable.toString", r.toString().equals(Javapkg.ToStringPrefix));
+		assertEquals("GoRunnable.toString", r.toString(), Javapkg.ToStringPrefix);
 		Runnable r2 = ((GoRunnable)r).getThis();
 		assertTrue("GoObject.this", r == r2);
 		Object o = new GoObject();
diff --git a/bind/testpkg/javapkg/classes.go b/bind/testpkg/javapkg/classes.go
index 9915391..865c0ab 100644
--- a/bind/testpkg/javapkg/classes.go
+++ b/bind/testpkg/javapkg/classes.go
@@ -22,6 +22,7 @@ const (
 )
 
 type GoRunnable struct {
+	lang.Object
 	lang.Runnable
 	this lang.Runnable
 }
diff --git a/internal/importers/java/java.go b/internal/importers/java/java.go
index 0eb4764..69b2254 100644
--- a/internal/importers/java/java.go
+++ b/internal/importers/java/java.go
@@ -454,7 +454,7 @@ func (j *importer) scanClass(s *bufio.Scanner, name string) (*Class, error) {
 	if len(cls.Supers) == 0 {
 		if name == "java.lang.Object" {
 			cls.HasNoArgCon = true
-		} else {
+		} else if !cls.Interface {
 			cls.Supers = append(cls.Supers, "java.lang.Object")
 		}
 	}