diff --git a/appveyor.yml b/appveyor.yml
index 957acab..3f624a5 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -10,8 +10,8 @@ environment:
   - THREAD_SAFE: "true"
   - THREAD_SAFE: "false"
   PHP:
-  - PHP_VERSION: 7.2.10
-    PHP_BRANCH: 7.2
+  - PHP_VERSION: "7.2.10"
+    PHP_BRANCH: "7.2"
 
 shallow_clone: true