diff --git a/appveyor.yml b/appveyor.yml
index a30ba543a..6a777eb6e 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -43,7 +43,7 @@ build_script:
   - CD %APPVEYOR_BUILD_FOLDER%
   - IF NOT EXIST C:\tmp MKDIR C:\tmp
   - SET SQUIRREL_TEMP=C:\tmp
-  - IF [%APPVEYOR_REPO_BRANCH:~-9%]==[-releases] SET IS_RELEASE_BRANCH=true
+  - 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 [%TASK%]==[installer] (