diff --git a/layout/base/nsFrameManager.cpp b/layout/base/nsFrameManager.cpp
index ff7033b0d243..bedf8ee3514b 100644
--- a/layout/base/nsFrameManager.cpp
+++ b/layout/base/nsFrameManager.cpp
@@ -1293,7 +1293,7 @@ FrameManager::ReResolveStyleContext(nsIPresContext* aPresContext,
           // only do frames that are in flow
           nsCOMPtr<nsIAtom> frameType;
           child->GetFrameType(getter_AddRefs(frameType));
-          if (nsLayoutAtoms::placeholderFrame == frameType) { // placeholder
+          if (nsLayoutAtoms::placeholderFrame == frameType.get()) { // placeholder
             // get out of flow frame and recurse there
             nsIFrame* outOfFlowFrame = ((nsPlaceholderFrame*)child)->GetOutOfFlowFrame();
             NS_ASSERTION(outOfFlowFrame, "no out-of-flow frame");
diff --git a/layout/html/base/src/nsFrameManager.cpp b/layout/html/base/src/nsFrameManager.cpp
index ff7033b0d243..bedf8ee3514b 100644
--- a/layout/html/base/src/nsFrameManager.cpp
+++ b/layout/html/base/src/nsFrameManager.cpp
@@ -1293,7 +1293,7 @@ FrameManager::ReResolveStyleContext(nsIPresContext* aPresContext,
           // only do frames that are in flow
           nsCOMPtr<nsIAtom> frameType;
           child->GetFrameType(getter_AddRefs(frameType));
-          if (nsLayoutAtoms::placeholderFrame == frameType) { // placeholder
+          if (nsLayoutAtoms::placeholderFrame == frameType.get()) { // placeholder
             // get out of flow frame and recurse there
             nsIFrame* outOfFlowFrame = ((nsPlaceholderFrame*)child)->GetOutOfFlowFrame();
             NS_ASSERTION(outOfFlowFrame, "no out-of-flow frame");