diff --git a/_pytest/python.py b/_pytest/python.py
index 913a3079e..26511ea05 100644
--- a/_pytest/python.py
+++ b/_pytest/python.py
@@ -1529,7 +1529,8 @@ class FixtureManager:
         self._nodename2fixtureinfo = {}
 
     def getfixtureinfo(self, node, func, cls, funcargs=True):
-        key = (node, func.__name__)
+        # node is the "collection node" for "func"
+        key = (node, func)
         try:
             return self._nodename2fixtureinfo[key]
         except KeyError:
diff --git a/testing/python/metafunc.py b/testing/python/metafunc.py
index dc37a03a6..e830389e1 100644
--- a/testing/python/metafunc.py
+++ b/testing/python/metafunc.py
@@ -630,6 +630,22 @@ class TestMetafuncFunctional:
             "*3 passed*"
         ])
 
+    def test_generate_same_function_names_issue403(self, testdir):
+        sub1 = testdir.makepyfile("""
+            import pytest
+
+            def make_tests():
+                @pytest.mark.parametrize("x", range(2))
+                def test_foo(x):
+                    pass
+                return test_foo
+
+            test_x = make_tests()
+            test_y = make_tests()
+        """)
+        reprec = testdir.inline_run()
+        reprec.assertoutcome(passed=4)
+
 
 class TestMarkersWithParametrization:
     pytestmark = pytest.mark.issue308