diff --git a/clientscr/gfx_cleanup.mm b/clientscr/gfx_cleanup.mm
index 681d13c81e..b204cdcab7 100644
--- a/clientscr/gfx_cleanup.mm
+++ b/clientscr/gfx_cleanup.mm
@@ -65,7 +65,7 @@ void killGfxApp(pid_t thePID) {
     char userName[64];
     RPC_CLIENT *rpc;
     int retval;
-    string msg;
+    std::string msg;
     
     chdir("/Library/Application Support/BOINC Data");
     safe_strcpy(buf, "");