diff --git a/appveyor.yml b/appveyor.yml
index 7834cb1e7..41eca218c 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -21,10 +21,10 @@ install:
   - cmd: tsc -v
 build_script:
   - ps: |
-      $deployBranches = @{
-        feature/v4,
-        develop,
-        master
+      $deployBranches = {
+        "feature/v4",
+        "develop",
+        "master"
       }
       If(($env:APPVEYOR_REPO_BRANCH -in $deployBranches -Or $env:APPVEYOR_REPO_COMMIT_MESSAGE -Match '!deploy') -And $env:APPVEYOR_REPO_COMMIT_MESSAGE -notlike '!build') {
         Write-Output "This is a deployment build"