diff --git a/layout/base/src/nsContainerFrame.h b/layout/base/src/nsContainerFrame.h
index 6889f1d8a03e..6c257c4d7b8a 100644
--- a/layout/base/src/nsContainerFrame.h
+++ b/layout/base/src/nsContainerFrame.h
@@ -115,6 +115,8 @@ public:
                                    nsIFrame*        aParent,
                                    nsIStyleContext* aStyleContext,
                                    nsIFrame*&       aContinuingFrame);
+  NS_IMETHOD DidReflow(nsIPresContext& aPresContext,
+                       nsDidReflowStatus aStatus);
 
   // Painting
   NS_IMETHOD Paint(nsIPresContext&      aPresContext,