diff --git a/mobile/android/services/src/main/java/org/mozilla/gecko/sync/ExtendedJSONObject.java b/mobile/android/services/src/main/java/org/mozilla/gecko/sync/ExtendedJSONObject.java
index 04778465c3a..e308f8619dc 100644
--- a/mobile/android/services/src/main/java/org/mozilla/gecko/sync/ExtendedJSONObject.java
+++ b/mobile/android/services/src/main/java/org/mozilla/gecko/sync/ExtendedJSONObject.java
@@ -173,37 +173,6 @@ public class ExtendedJSONObject {
     this.object = o;
   }
 
-  public ExtendedJSONObject deepCopy() {
-    final ExtendedJSONObject out = new ExtendedJSONObject();
-    @SuppressWarnings("unchecked")
-    final Set<Map.Entry<String, Object>> entries = this.object.entrySet();
-    for (Map.Entry<String, Object> entry : entries) {
-      final String key = entry.getKey();
-      final Object value = entry.getValue();
-      if (value instanceof JSONArray) {
-        // Oh god.
-        try {
-          out.put(key, new JSONParser().parse(((JSONArray) value).toJSONString()));
-        } catch (ParseException e) {
-          // This should never occur, because we're round-tripping.
-        }
-        continue;
-      }
-      if (value instanceof JSONObject) {
-        out.put(key, new ExtendedJSONObject((JSONObject) value).deepCopy().object);
-        continue;
-      }
-      if (value instanceof ExtendedJSONObject) {
-        out.put(key, ((ExtendedJSONObject) value).deepCopy());
-        continue;
-      }
-      // Oh well.
-      out.put(key, value);
-    }
-
-    return out;
-  }
-
   public ExtendedJSONObject(Reader in) throws IOException, ParseException, NonObjectJSONException {
     if (in == null) {
       this.object = new JSONObject();
diff --git a/mobile/android/tests/background/junit4/src/org/mozilla/gecko/sync/test/TestExtendedJSONObject.java b/mobile/android/tests/background/junit4/src/org/mozilla/gecko/sync/test/TestExtendedJSONObject.java
index 4b6a204f534..413f51ce60d 100644
--- a/mobile/android/tests/background/junit4/src/org/mozilla/gecko/sync/test/TestExtendedJSONObject.java
+++ b/mobile/android/tests/background/junit4/src/org/mozilla/gecko/sync/test/TestExtendedJSONObject.java
@@ -32,17 +32,6 @@ public class TestExtendedJSONObject {
   public static String exampleJSON = "{\"modified\":1233702554.25,\"success\":[\"{GXS58IDC}12\",\"{GXS58IDC}13\",\"{GXS58IDC}15\",\"{GXS58IDC}16\",\"{GXS58IDC}18\",\"{GXS58IDC}19\"],\"failed\":{\"{GXS58IDC}11\":[\"invalid parentid\"],\"{GXS58IDC}14\":[\"invalid parentid\"],\"{GXS58IDC}17\":[\"invalid parentid\"],\"{GXS58IDC}20\":[\"invalid parentid\"]}}";
   public static String exampleIntegral = "{\"modified\":1233702554,}";
 
-  @Test
-  public void testDeepCopy() throws NonObjectJSONException, IOException, ParseException, NonArrayJSONException {
-    ExtendedJSONObject a = new ExtendedJSONObject(exampleJSON);
-    ExtendedJSONObject c = a.deepCopy();
-    assertTrue(a != c);
-    assertTrue(a.equals(c));
-    assertTrue(a.get("modified") == c.get("modified"));
-    assertTrue(a.getArray("success") != c.getArray("success"));
-    assertTrue(a.getArray("success").equals(c.getArray("success")));
-  }
-
   @Test
   public void testFractional() throws IOException, ParseException, NonObjectJSONException {
     ExtendedJSONObject o = new ExtendedJSONObject(exampleJSON);