diff --git a/python/examples/imdb/test_client_multithread.py b/python/examples/imdb/test_client_multithread.py
index 934164a9c6fe62e1c84b913205b70492574cab51..c5122c31a0fb859cfc81a392228f25422287a140 100644
--- a/python/examples/imdb/test_client_multithread.py
+++ b/python/examples/imdb/test_client_multithread.py
@@ -62,5 +62,5 @@ def predict_multi_thread(p_num):
 if __name__ == '__main__':
     conf_file = sys.argv[1]
     data_file = sys.argv[2]
-    p_num = sys.argv[3]
+    p_num = int(sys.argv[3])
     predict_multi_thread(p_num)