diff --git a/clientscr/mac_saver_module.cpp b/clientscr/mac_saver_module.cpp
index d68c321e73..8e9d846e20 100755
--- a/clientscr/mac_saver_module.cpp
+++ b/clientscr/mac_saver_module.cpp
@@ -466,6 +466,7 @@ void closeBOINCSaver() {
         }
 #endif
         delete rpc;
+        rpc = NULL;
     }
 
     setBannerText(0, NULL);