diff --git a/appveyor.yml b/appveyor.yml
index 1ee8bc46..e2f73236 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -60,6 +60,5 @@ for:
       - pip install dist/`ls dist`
 
 test_script:
-  - cd tests;
-  - python test_all.py
+  - ps: cd tests; python test_all.py