diff --git a/layout/base/nsPresContext.h b/layout/base/nsPresContext.h
index 35365e70d72c0..fdfcc812a821f 100644
--- a/layout/base/nsPresContext.h
+++ b/layout/base/nsPresContext.h
@@ -1504,11 +1504,11 @@ class nsPresContext : public nsIObserver,
 
 #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