diff --git a/appveyor.yml b/appveyor.yml
index 6a777eb6e4f..240f89244ad 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -45,7 +45,7 @@ build_script:
   - SET SQUIRREL_TEMP=C:\tmp
   - IF [%APPVEYOR_REPO_BRANCH:~-9%]==[-releases] IF NOT DEFINED APPVEYOR_PULL_REQUEST_NUMBER SET IS_RELEASE_BRANCH=true
   - IF [%APPVEYOR_REPO_BRANCH%]==[master] IF NOT DEFINED APPVEYOR_PULL_REQUEST_NUMBER SET IS_SIGNED_ZIP_BRANCH=true
-  - IF [%APPVEYOR_REPO_BRANCH:~0,9%]==[electron-] SET IS_SIGNED_ZIP_BRANCH=true
+  - IF [%APPVEYOR_REPO_BRANCH:~0,9%]==[electron-] IF NOT DEFINED APPVEYOR_PULL_REQUEST_NUMBER SET IS_SIGNED_ZIP_BRANCH=true
   - IF [%TASK%]==[installer] (
       IF [%IS_RELEASE_BRANCH%]==[true] (
         ECHO Building on release branch - Creating production artifacts &&