diff --git a/src/MacVim/MMBackend.m b/src/MacVim/MMBackend.m
index 2cc1036b1b..5806e09b6a 100644
--- a/src/MacVim/MMBackend.m
+++ b/src/MacVim/MMBackend.m
@@ -342,7 +342,7 @@ extern GuiFont gui_mch_retain_font(GuiFont font);
         frontendProxy = [proxy connectBackend:self pid:pid];
         if (frontendProxy) {
             [frontendProxy retain];
-            [frontendProxy setProtocolForProxy:@protocol(MMAppProtocol)];
+            [frontendProxy setProtocolForProxy:@protocol(MMFrontendProtocol)];
             ok = YES;
         }
     }