diff --git a/modules/plugin/base/src/nsPluginDirServiceProvider.cpp b/modules/plugin/base/src/nsPluginDirServiceProvider.cpp
index 9cfec0ac2d06..3d062ab8a4e7 100644
--- a/modules/plugin/base/src/nsPluginDirServiceProvider.cpp
+++ b/modules/plugin/base/src/nsPluginDirServiceProvider.cpp
@@ -224,7 +224,7 @@ nsPluginDirServiceProvider::GetFile(const char *prop, PRBool *persistant,
 
   NS_ENSURE_ARG(prop);
   *_retval = nsnull;
-  *persistant = PR_TRUE;
+  *persistant = PR_FALSE;
 
   nsCOMPtr<nsIPrefBranch> prefs(do_GetService(NS_PREFSERVICE_CONTRACTID));
   if (!prefs) {