diff --git a/src/allmydata/test/test_windows.py b/src/allmydata/test/test_windows.py
index 81638f6e4..fddb60389 100644
--- a/src/allmydata/test/test_windows.py
+++ b/src/allmydata/test/test_windows.py
@@ -120,13 +120,13 @@ class GetArgvTests(SyncTestCase):
         argv = [executable, save_argv_path.path] + argv
         returncode = Popen(argv, stdin=PIPE, stdout=PIPE, stderr=PIPE).wait()
         self.assertThat(
-            0,
-            Equals(returncode),
+            returncode,
+            Equals(0),
         )
         with open(saved_argv_path.path, "rt") as f:
             saved_argv = load(f)
 
         self.assertThat(
-            argv,
-            Equals(saved_argv),
+            saved_argv,
+            Equals(argv),
         )