diff --git a/appveyor.yml b/appveyor.yml
index ed0d5a0..45afa94 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -27,7 +27,7 @@ test_script:
 
 on_success:
   - sh: |
-      if [ ! apk add curl jq ]; then
+      if !(apk add curl jq); then
         exit 1
       fi
       CURR_VER=$(cat package.json | jq -r .version)