diff --git a/src/_pytest/assertion/util.py b/src/_pytest/assertion/util.py
index be5f23aa2..7f83767a0 100644
--- a/src/_pytest/assertion/util.py
+++ b/src/_pytest/assertion/util.py
@@ -10,6 +10,7 @@ from typing import List
 from typing import Mapping
 from typing import Optional
 from typing import Sequence
+from unicodedata import normalize
 
 import _pytest._code
 from _pytest import outcomes