diff --git a/src/java_lang_System.cc b/src/java_lang_System.cc
index 2bb767d..398eeb9 100644
--- a/src/java_lang_System.cc
+++ b/src/java_lang_System.cc
@@ -187,8 +187,7 @@
   if (sameDimensions && srcComponentType->InstanceOf(dstComponentType)) {
     // Yes. Bulk copy.
     move32(dstBytes + dstPos * width, srcBytes + srcPos * width, length * width);
-    UNIMPLEMENTED(WARNING) << "write barriers in System.arraycopy";
-    //dvmWriteBarrierArray(dstArray, dstPos, dstPos + length);
+    Heap::WriteBarrier(dstArray);
     return;
   }
 
@@ -228,8 +227,7 @@
   }
 
   move32(dstBytes + dstPos * width, srcBytes + srcPos * width, copyCount * width);
-  UNIMPLEMENTED(WARNING) << "write barriers in System.arraycopy";
-  //dvmWriteBarrierArray(dstArray, 0, copyCount);
+  Heap::WriteBarrier(dstArray);
   if (copyCount != length) {
     std::string actualSrcType(PrettyType(srcObj[copyCount]));
     std::string dstType(PrettyType(dstArray));