diff --git a/xpfe/components/history/src/nsGlobalHistory.cpp b/xpfe/components/history/src/nsGlobalHistory.cpp
index 6718d8fb9ad2..b54f91310690 100644
--- a/xpfe/components/history/src/nsGlobalHistory.cpp
+++ b/xpfe/components/history/src/nsGlobalHistory.cpp
@@ -2507,7 +2507,7 @@ nsGlobalHistory::CloseDB()
   if (mEnv)
     mEnv->CloseMdbObject(mEnv /* XXX */);
 
-  mTable = mEnv = mStore = nsnull;
+  mTable = nsnull; mEnv = nsnull; mStore = nsnull;
 
   return NS_OK;
 }