diff --git a/mozilla/layout/forms/nsHTMLButtonControlFrame.cpp b/mozilla/layout/forms/nsHTMLButtonControlFrame.cpp
index 083117e47fc..3651c2c4efb 100644
--- a/mozilla/layout/forms/nsHTMLButtonControlFrame.cpp
+++ b/mozilla/layout/forms/nsHTMLButtonControlFrame.cpp
@@ -73,7 +73,10 @@
 #include "nsIAccessibilityService.h"
 #endif
 
+#if 0
+// see nsHTMLButtonControlFrame::Reflow()
 static NS_DEFINE_IID(kViewCID, NS_VIEW_CID);
+#endif
 
 nsresult
 NS_NewHTMLButtonControlFrame(nsIPresShell* aPresShell, nsIFrame** aNewFrame)
diff --git a/mozilla/layout/html/forms/src/nsHTMLButtonControlFrame.cpp b/mozilla/layout/html/forms/src/nsHTMLButtonControlFrame.cpp
index 083117e47fc..3651c2c4efb 100644
--- a/mozilla/layout/html/forms/src/nsHTMLButtonControlFrame.cpp
+++ b/mozilla/layout/html/forms/src/nsHTMLButtonControlFrame.cpp
@@ -73,7 +73,10 @@
 #include "nsIAccessibilityService.h"
 #endif
 
+#if 0
+// see nsHTMLButtonControlFrame::Reflow()
 static NS_DEFINE_IID(kViewCID, NS_VIEW_CID);
+#endif
 
 nsresult
 NS_NewHTMLButtonControlFrame(nsIPresShell* aPresShell, nsIFrame** aNewFrame)