diff --git a/appveyor.yml b/appveyor.yml
index 0890ef1d..6c130054 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -3,11 +3,11 @@ pull_requests:
   do_not_increment_build_number: true
 environment:
   matrix:
-    - PYTHON: C:\Python37-x64
-      PYTHON_VERSION: 3.7
+    - PYTHON: "C:\Python37-x64"
+      PYTHON_VERSION: "3.7"
 
-    - PYTHON: C:\Python38-x64
-      PYTHON_VERSION: 3.8
+    - PYTHON: "C:\Python38-x64"
+      PYTHON_VERSION: "3.8"
 install:
   - cmd: %PYTHON% -m pip install --upgrade pip
   - cmd: %PYTHON% -m pip install -r requirements.txt --upgrade