diff --git a/src/_macosx.m b/src/_macosx.m
index 5e70e975c138..8c7ac2366293 100755
--- a/src/_macosx.m
+++ b/src/_macosx.m
@@ -1376,8 +1376,8 @@ - (void)launch:(NSNotification*)notification
     CFMachPortRef port;
     CFRunLoopSourceRef source;
     NSDictionary* dictionary = [notification userInfo];
-    if (![[dictionary valueForKey:@"NSApplicationName"]
-            localizedCaseInsensitiveContainsString:@"python"])
+    if (! [[dictionary valueForKey:@"NSApplicationName"]
+           isEqualToString:@"Python"])
         return;
     NSNumber* psnLow = [dictionary valueForKey: @"NSApplicationProcessSerialNumberLow"];
     NSNumber* psnHigh = [dictionary valueForKey: @"NSApplicationProcessSerialNumberHigh"];