diff --git a/mailnews/base/src/nsMsgServiceProvider.cpp b/mailnews/base/src/nsMsgServiceProvider.cpp
index e6d69505f402f846e3473223d6c792f345bdeecb..7d86174a1448c687704159b993ef514e8b9fcd2a 100644
--- a/mailnews/base/src/nsMsgServiceProvider.cpp
+++ b/mailnews/base/src/nsMsgServiceProvider.cpp
@@ -77,7 +77,7 @@ nsMsgServiceProviderService::Init()
   NS_ENSURE_SUCCESS(rv,rv);
 
   // test if there is a locale provider
-  PRBool isexists = false;
+  PRBool isexists = PR_FALSE;
   rv = dataFilesDir->Exists(&isexists);
   NS_ENSURE_SUCCESS(rv,rv);
   if (isexists) {