diff --git a/tests/debug.py b/tests/debug.py
index 9111c663ea..1699fe366c 100644
--- a/tests/debug.py
+++ b/tests/debug.py
@@ -139,4 +139,4 @@ if __name__ == '__main__':
     pids = subprocess.check_output(command, shell=True)
     pids = pids.strip()
 
-    print(pids)
+    print(str(pids))