diff --git a/dev/core/src/com/google/gwt/dev/jjs/impl/Finalizer.java b/dev/core/src/com/google/gwt/dev/jjs/impl/Finalizer.java
index 60df1ab..bebe4ea 100644
--- a/dev/core/src/com/google/gwt/dev/jjs/impl/Finalizer.java
+++ b/dev/core/src/com/google/gwt/dev/jjs/impl/Finalizer.java
@@ -73,9 +73,10 @@
 
     @Override
     public void exit(JField x, Context ctx) {
-      if (!x.isVolatile()) {
-        maybeFinalize(x);
+      if (x.isVolatile() || x.canBeImplementedExternally() || x.canBeReferencedExternally()) {
+        return;
       }
+      maybeFinalize(x);
     }
 
     @Override
diff --git a/user/test/com/google/gwt/core/interop/JsPropertyTest.java b/user/test/com/google/gwt/core/interop/JsPropertyTest.java
index dbf9b25..e3fb9e7 100644
--- a/user/test/com/google/gwt/core/interop/JsPropertyTest.java
+++ b/user/test/com/google/gwt/core/interop/JsPropertyTest.java
@@ -503,13 +503,30 @@
     @JsProperty
     public String field;
   }
-  private native String getB(B b)/*-{
+
+  private native String getB(B b) /*-{
     return b.field;
   }-*/;
 
-  public void testNotReadExpoprtedFieldNotPruned() {
+  public void testNotReadExportedFieldNotPruned() {
     B b = new B();
     b.field = "secret";
     assertEquals("secret", getB(b));
   }
+
+  @JsType
+  static class ClassWithFieldNotWrittenInJava {
+    public int fieldNotWrittenInJava = 0;
+  }
+
+  private native String setFieldNotWrittenInJava(Object obj, int value) /*-{
+    obj.fieldNotWrittenInJava = value;
+  }-*/;
+
+  public void testFieldNotWrittenInJava() {
+    ClassWithFieldNotWrittenInJava obj = new ClassWithFieldNotWrittenInJava();
+    assertEquals(0, obj.fieldNotWrittenInJava);
+    setFieldNotWrittenInJava(obj, 2);
+    assertEquals(2, obj.fieldNotWrittenInJava);
+  }
 }