diff --git a/src/_pytest/python_api.py b/src/_pytest/python_api.py
index 35560f168..200b2b3aa 100644
--- a/src/_pytest/python_api.py
+++ b/src/_pytest/python_api.py
@@ -265,7 +265,7 @@ class ApproxMapping(ApproxBase):
             approx_side_as_map.items(), other_side.values()
         ):
             if approx_value != other_value:
-                if not any((approx_value.expected is None, other_value is None)):
+                if approx_value.expected is not None and other_value is not None:
                     max_abs_diff = max(
                         max_abs_diff, abs(approx_value.expected - other_value)
                     )