diff --git a/Lib/test/test_subprocess.py b/Lib/test/test_subprocess.py
index dc57c46..365ac91 100644
--- a/Lib/test/test_subprocess.py
+++ b/Lib/test/test_subprocess.py
@@ -135,7 +135,7 @@
         self.assertEqual(p.stderr, None)
 
     def test_executable_with_cwd(self):
-        python_dir = os.path.dirname(os.path.realpath(sys.executable))
+        python_dir = os.path.realpath(os.path.dirname(sys.executable))
         p = subprocess.Popen(["somethingyoudonthave", "-c",
                               "import sys; sys.exit(47)"],
                              executable=sys.executable, cwd=python_dir)