diff --git a/package/ci/appveyor.yml b/package/ci/appveyor.yml
index 9b59caf3a..512557f8a 100644
--- a/package/ci/appveyor.yml
+++ b/package/ci/appveyor.yml
@@ -13,7 +13,7 @@ install:
 - cinst ninja
 build_script:
 # https://github.com/appveyor/ci/issues/414
-- ren 'C:\Program Files (x86)\Windows Kits\10\include\wdf' '00wdf'
+- ren "C:\Program Files (x86)\Windows Kits\10\include\wdf" 00wdf
 - call "C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/vcvarsall.bat"
 - appveyor DownloadFile http://kcat.strangesoft.net/openal-soft-1.16.0-bin.zip
 - 7z x openal-soft-1.16.0-bin.zip