s/exit/sys.exit/
diff --git a/tools/run_tests/run_interop_tests.py b/tools/run_tests/run_interop_tests.py
index a71ebc6..e1d60b2 100755
--- a/tools/run_tests/run_interop_tests.py
+++ b/tools/run_tests/run_interop_tests.py
@@ -681,7 +681,7 @@
                      do_newline=True)
       for image in docker_images.itervalues():
         dockerjob.remove_image(image, skip_nonexistent=True)
-      exit(1);
+      sys.exit(1)
 
 # Start interop servers.
 server_jobs={}