diff --git a/appveyor.yml b/appveyor.yml
index d00dfbd7..e1ba1d92 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -12,5 +12,5 @@ install:
   - "%PYTHON%/Scripts/pip.exe install matplotlib"
 
 test_script:
-  - "%PYTHON%\python.exe -m unittest discover C:/projects/pythonrobotics/tests"
+  - "%PYTHON%/python.exe -m unittest discover C:/projects/pythonrobotics/tests"