diff --git a/break-ex10.py b/break-ex10.py
index bdba748..2f2b2ea 100644
--- a/break-ex10.py
+++ b/break-ex10.py
@@ -5,6 +5,6 @@ import sys
 
 argc = int(sys.argv[1]) if sys.argv[1:] else 23694
 command = "valgrind ./ex10 " + " ".join(map(str, range(argc)))
-print("command = {}".format(command))
+print("command = {0}".format(command))
 
 os.system(command)