diff --git a/hack/verify-flags-underscore.py b/hack/verify-flags-underscore.py
index 169f7944932..e6d891da9c2 100755
--- a/hack/verify-flags-underscore.py
+++ b/hack/verify-flags-underscore.py
@@ -35,7 +35,7 @@ def is_binary(pathname):
     try:
         with open(pathname, 'r') as f:
             CHUNKSIZE = 1024
-            while 1:
+            while True:
                 chunk = f.read(CHUNKSIZE)
                 if '\0' in chunk: # found null byte
                     return True