diff --git a/debugger/SkDebugCanvas.cpp b/debugger/SkDebugCanvas.cpp
index 59f982a..4751be7 100644
--- a/debugger/SkDebugCanvas.cpp
+++ b/debugger/SkDebugCanvas.cpp
@@ -89,6 +89,8 @@
         i = 0;
         canvas->clear(0);
         canvas->resetMatrix();
+        SkRect rect = SkRect::MakeWH(fWidth, fHeight);
+        canvas->clipRect(rect, SkRegion::kReplace_Op );
         applyUserTransform(canvas);
     }