diff --git a/include/ui/GraphicBuffer.h b/include/ui/GraphicBuffer.h
index 4b9b5a833..ea9368d85 100644
--- a/include/ui/GraphicBuffer.h
+++ b/include/ui/GraphicBuffer.h
@@ -24,6 +24,7 @@
 #include <ui/PixelFormat.h>
 #include <ui/Rect.h>
 #include <utils/Flattenable.h>
+#include <utils/RefBase.h>
 
 
 struct ANativeWindowBuffer;
@@ -37,10 +38,8 @@ class GraphicBufferMapper;
 // ===========================================================================
 
 class GraphicBuffer
-    : public ANativeObjectBase<
-        ANativeWindowBuffer,
-        GraphicBuffer, 
-        LightRefBase<GraphicBuffer> >, public Flattenable
+    : public ANativeObjectBase< ANativeWindowBuffer, GraphicBuffer, RefBase >,
+      public Flattenable
 {
 public:
 
diff --git a/libs/utils/RefBase.cpp b/libs/utils/RefBase.cpp
index e80a795b7..2b39bce2e 100644
--- a/libs/utils/RefBase.cpp
+++ b/libs/utils/RefBase.cpp
@@ -199,7 +199,7 @@ public:
         {
             char name[100];
             snprintf(name, 100, "/data/%p.stack", this);
-            int rc = open(name, O_RDWR | O_CREAT | O_APPEND);
+            int rc = open(name, O_RDWR | O_CREAT | O_APPEND, 644);
             if (rc >= 0) {
                 write(rc, text.string(), text.length());
                 close(rc);