diff --git a/changelog/13503.bugfix.rst b/changelog/13503.bugfix.rst
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/src/_pytest/python.py b/src/_pytest/python.py
index 7374fa3cee0..a43443c2077 100644
--- a/src/_pytest/python.py
+++ b/src/_pytest/python.py
@@ -1526,9 +1526,9 @@ def _find_parametrized_scope(
     if all_arguments_are_fixtures:
         fixturedefs = arg2fixturedefs or {}
         used_scopes = [
-            fixturedef[-1]._scope
-            for name, fixturedef in fixturedefs.items()
-            if name in argnames
+            fixturedefs[name][-1]._scope  # correction part
+            for name in argnames
+            if name in fixturedefs
         ]
         # Takes the most narrow scope from used fixtures.
         return min(used_scopes, default=Scope.Function)