diff --git a/appveyor.yml b/appveyor.yml
index cd7057b..b2e4b57 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -52,8 +52,7 @@ install:
             ..
 
 build_script:
-  - ps: |
-        cmake --build . --target $env:BUILD_TARGET
+  - cmake --build . --target %BUILD_TARGET%
 
 before_deploy:
   - ps: |