diff --git a/appveyor.yml b/appveyor.yml
index d15e923..4878844 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -4,16 +4,19 @@ skip_commits:
     - '**/*.md'
     - '**/*.aip'
 image: Visual Studio 2017
-environment:
-  BUILD_VERSION: '%APPVEYOR_BUILD_VERSION%-%APPVEYOR_REPO_COMMIT:~0,8%'
-  BUILD_VERSION_COMMA_SEP: '%APPVEYOR_BUILD_VERSION:.=,%'
-  BUILD_ZIPFILE: '%APPVEYOR_BUILD_FOLDER%\%APPVEYOR_PROJECT_NAME%_v%BUILD_VERSION%_%PLATFORM%.zip'
 configuration: Release
 platform:
   - x86
   - x64
 build:
   verbosity: minimal
+before_build:
+- cmd: >-
+    set "BUILD_VERSION=%APPVEYOR_BUILD_VERSION%-%APPVEYOR_REPO_COMMIT:~0,8%"
+
+    set "BUILD_VERSION_COMMA_SEP=%APPVEYOR_BUILD_VERSION:.=,%"
+
+    set "BUILD_ZIPFILE=%APPVEYOR_BUILD_FOLDER%\%APPVEYOR_PROJECT_NAME%_v%BUILD_VERSION%_%PLATFORM%.zip"
 after_build:
 - cmd: >-
     copy /Y "wufuc\bin\%CONFIGURATION%\%PLATFORM%\wufuc*.dll" "setup-batch\"