diff --git a/_pytest/python.py b/_pytest/python.py
index 50eb870b9..7bb9ea691 100644
--- a/_pytest/python.py
+++ b/_pytest/python.py
@@ -1836,10 +1836,10 @@ def getfuncargnames(function, startindex=None):
     if startindex is None:
         startindex = inspect.ismethod(function) and 1 or 0
     if realfunction != function:
-        mock_default = sys.modules.get('mock.DEFAULT')
-        if mock_default:
+        mock = sys.modules.get('mock')
+        if mock is not None:
             for patching in getattr(function, "patchings", []):
-                if not patching.attribute_name and patching.new is DEFAULT:
+                if not patching.attribute_name and patching.new is mock.DEFAULT:
                     startindex += 1
         else:
             startindex += len(getattr(function, "patchings", []))