diff --git a/MMBackend.h b/MMBackend.h
index dfa1222208..1a7f0e826a 100644
--- a/MMBackend.h
+++ b/MMBackend.h
@@ -46,7 +46,7 @@
 - (void)setDefaultColorsBackground:(int)bg foreground:(int)fg;
 
 - (BOOL)checkin;
-- (BOOL)openVimWindowWithRows:(int)rows columns:(int)cols;
+- (BOOL)openVimWindow;
 - (void)clearAll;
 - (void)clearBlockFromRow:(int)row1 column:(int)col1
                     toRow:(int)row2 column:(int)col2;
diff --git a/MMBackend.m b/MMBackend.m
index 98e5853201..a2a1a4567d 100644
--- a/MMBackend.m
+++ b/MMBackend.m
@@ -199,7 +199,7 @@ static int eventButtonNumberToVimMouseButton(int buttonNumber);
 #endif
 }
 
-- (BOOL)openVimWindowWithRows:(int)rows columns:(int)cols
+- (BOOL)openVimWindow
 {
 #if !MM_USE_DO
     if (!sendPort) {
@@ -228,13 +228,7 @@ static int eventButtonNumberToVimMouseButton(int buttonNumber);
     }
 #endif // !MM_USE_DO
 
-    NSMutableData *data = [NSMutableData data];
-
-    [data appendBytes:&rows length:sizeof(int)];
-    [data appendBytes:&cols length:sizeof(int)];
-
-    [self queueMessage:OpenVimWindowMsgID data:data];
-
+    [self queueMessage:OpenVimWindowMsgID data:nil];
     return YES;
 }
 
diff --git a/gui_macvim.m b/gui_macvim.m
index 1282d9ac97..34911e613c 100644
--- a/gui_macvim.m
+++ b/gui_macvim.m
@@ -115,8 +115,7 @@ gui_mch_open(void)
 {
     //NSLog(@"gui_mch_open()");
 
-    return [[MMBackend sharedInstance]
-            openVimWindowWithRows:gui.num_rows columns:gui.num_cols];
+    return [[MMBackend sharedInstance] openVimWindow];
 }