diff --git a/appveyor.yml b/appveyor.yml
index 28723e64..2c74f46b 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -32,7 +32,7 @@ after_build:
 - cmd: if %platform%==x64   set RELEASE_ARCH=x64
 - cmd: 7z a sfizz-lv2-%APPVEYOR_REPO_TAG_NAME%-%RELEASE_ARCH%-msvc.zip sfizz.lv2
 - cmd: 7z a sfizz-lib-%APPVEYOR_REPO_TAG_NAME%-%RELEASE_ARCH%-msvc.zip src/Release/sfizz*
-- cmd: iscc.exe ./../innosetup.iss
+- cmd: iscc.exe /dARCH=%RELEASE_ARCH% ./../innosetup.iss
 - cmd: mv ./../Output/sfizz-lv2-setup.exe sfizz-lv2-%APPVEYOR_REPO_TAG_NAME%-%RELEASE_ARCH%-msvc-setup.exe
 
 artifacts: