diff --git a/mozilla/browser/components/places/src/nsNavHistoryResult.cpp b/mozilla/browser/components/places/src/nsNavHistoryResult.cpp
index 7d0e96604dc..89d59869189 100755
--- a/mozilla/browser/components/places/src/nsNavHistoryResult.cpp
+++ b/mozilla/browser/components/places/src/nsNavHistoryResult.cpp
@@ -1565,7 +1565,7 @@ nsNavHistoryContainerResultNode::ClearContents()
   PRUint32 oldAccessCount = mAccessCount;
   mAccessCount = 0;
   mTime = 0;
-  ReverseUpdateStats(-oldAccessCount);
+  ReverseUpdateStats(-PRInt32(oldAccessCount));
   return NS_OK;
 }