diff --git a/Lib/test/test_bytes.py b/Lib/test/test_bytes.py
index 58f51b61a1858c..48d3e14d4100ee 100644
--- a/Lib/test/test_bytes.py
+++ b/Lib/test/test_bytes.py
@@ -467,7 +467,7 @@ def test_fromhex(self):
         for value, position in (("a ", 1), (" aa a ", 5),(" aa a a ", 5)):
             with self.assertRaises(ValueError) as cm:
                 self.type2test.fromhex(value)
-            self.assertIn(f"non-hexadecimal number found in fromhex() arg at {position}", str(cm.exception))
+            self.assertIn(f"non-hexadecimal number found in fromhex() arg at position {position}", str(cm.exception))
 
         for data, pos in (
             # invalid first hexadecimal character