diff --git a/media/webrtc/trunk/build/mac/find_sdk.py b/media/webrtc/trunk/build/mac/find_sdk.py
index 3fd33d7b6c35..7217093c3ebe 100755
--- a/media/webrtc/trunk/build/mac/find_sdk.py
+++ b/media/webrtc/trunk/build/mac/find_sdk.py
@@ -84,7 +84,7 @@ def main():
 
 
 if __name__ == '__main__':
-  if sys.platform == 'darwin' or os.environ.get('MOZ_AUTOMATION') != '1':
+  if sys.platform == 'darwin' and os.environ.get('MOZ_AUTOMATION') != '1':
     print main()
   else:
     # Mozilla builds cross-compile on Linux or install an SDK from tooltool, so