diff --git a/src/_pytest/fixtures.py b/src/_pytest/fixtures.py
index 449232c80..5b6f4dddc 100644
--- a/src/_pytest/fixtures.py
+++ b/src/_pytest/fixtures.py
@@ -153,7 +153,7 @@ def get_scope_node(node: nodes.Node, scope: Scope) -> Optional[nodes.Node]:
 def getfixturemarker(obj: object) -> Optional["FixtureFunctionMarker"]:
     """Return fixturemarker or None if it doesn't exist or raised
     exceptions."""
-    if type(obj) is FixtureFunctionDefinition:
+    if isinstance(obj, FixtureFunctionDefinition):
         return obj._fixture_function_marker
     return None