diff --git a/mock.py b/mock.py
index f112345e0c0975f4490086568ab7ebb28b42b0c2..389a9cb716bc78dd2eada856bdfe4a5f619131e4 100644
--- a/mock.py
+++ b/mock.py
@@ -1235,12 +1235,6 @@ class _patch(object):
                     patching.__exit__(*exc_info)
 
         patched.patchings = [self]
-        if hasattr(func, 'func_code'):
-            # not in Python 3
-            patched.compat_co_firstlineno = getattr(
-                func, "compat_co_firstlineno",
-                func.func_code.co_firstlineno
-            )
         return patched