--- a/layout/base/nsPresContext.h
+++ b/layout/base/nsPresContext.h
@@ -1499,21 +1499,21 @@ protected:
   // Is there a pref update to process once we have a container?
   unsigned              mNeedsPrefUpdate : 1;
 
   // Has NotifyNonBlankPaint been called on this PresContext?
   unsigned              mHadNonBlankPaint : 1;
 
 #ifdef RESTYLE_LOGGING
   // Should we output debug information about restyling for this document?
-  bool                  mRestyleLoggingEnabled;
+  unsigned mRestyleLoggingEnabled : 1;
 #endif
 
 #ifdef DEBUG
-  bool                  mInitialized;
+  unsigned mInitialized : 1;
 #endif
 
 
 protected:
 
   virtual ~nsPresContext();
 
   nscolor MakeColorPref(const nsString& aColor);