diff --git a/appveyor.yml b/appveyor.yml
index a8fc3b920b..677b3b6b30 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -5,7 +5,7 @@ environment:
     - nodejs_version: "Current"
 
 cache:
-  - "%LOCALAPPDATA%\\Yarn" -> yarn.lock
+  - '%LOCALAPPDATA%\\Yarn -> yarn.lock'
 
 # Install scripts. (runs after repo cloning)
 install: