diff --git a/appveyor.yml b/appveyor.yml
index 2c0af4d4..82bed6c9 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -30,7 +30,7 @@ install:
 
 - if not exist "%UPX_ZIP%.zip" appveyor DownloadFile "%UPX_URL%" -FileName "%UPX_ZIP%.zip"
 - 7z x -y "%UPX_ZIP%.zip" -o%TMP% >null
-- robocopy /S /xx /ns /nc /nfl /ndl /np /njh /njs %TMP%\%UPX_ZIP% %MINGW_SDK\bin upx.exe || exit 0
+- robocopy /S /xx /ns /nc /nfl /ndl /np /njh /njs %TMP%\%UPX_ZIP% %MINGW_SDK%\bin upx.exe || exit 0
 
 - if not exist "%CCACHE_EXE%" appveyor DownloadFile "%CCACHE_URL%" -FileName "%CCACHE_EXE%"
 - ccache -M 99M