diff --git a/testing/python/fixture.py b/testing/python/fixture.py
index fe8af45f711..c12a9bdd445 100644
--- a/testing/python/fixture.py
+++ b/testing/python/fixture.py
@@ -542,7 +542,7 @@ def test_func():
                 pass
         """
         )
-        result = testdir.runpytest()
+        result = testdir.runpytest_subprocess()
         result.stdout.fnmatch_lines("* 1 passed in *")
 
     def test_getfixturevalue_recursive(self, testdir):