diff --git a/pkgs/build-support/docker/detjson.py b/pkgs/build-support/docker/detjson.py
index 439c2131387..fe82cbea11b 100644
--- a/pkgs/build-support/docker/detjson.py
+++ b/pkgs/build-support/docker/detjson.py
@@ -37,4 +37,4 @@ def main():
     json.dump(j, sys.stdout, sort_keys=True)
 
 if __name__ == '__main__':
-    main()
\ No newline at end of file
+    main()