diff --git a/src/MacVim/PSMTabBarControl/source/PSMTabBarControl.m b/src/MacVim/PSMTabBarControl/source/PSMTabBarControl.m
index 08f2487511..6c8bab1223 100644
--- a/src/MacVim/PSMTabBarControl/source/PSMTabBarControl.m
+++ b/src/MacVim/PSMTabBarControl/source/PSMTabBarControl.m
@@ -147,6 +147,10 @@ - (void)initAddedProperties
         }
         [_addTabButton setNeedsDisplay:YES];
     }
+
+#if MAC_OS_X_VERSION_MAX_ALLOWED >= 140000
+    [self setClipsToBounds:YES];
+#endif
 }
 
 - (id)initWithFrame:(NSRect)frame