diff --git a/src/cocoa_window.m b/src/cocoa_window.m
index 92635035..d2aab85f 100644
--- a/src/cocoa_window.m
+++ b/src/cocoa_window.m
@@ -777,6 +777,11 @@ static const NSRange kEmptyRange = { NSNotFound, 0 };
     return YES;
 }
 
+- (BOOL)canBecomeMainWindow
+{
+    return YES;
+}
+
 @end