diff --git a/appveyor.yml b/appveyor.yml
index de9660d0..e8af149c 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -25,11 +25,11 @@ cache:
 
 install:
 - if not exist "%NASM_ZIP%.zip" appveyor DownloadFile "%NASM_URL%" -FileName "%NASM_ZIP%.zip"
-- 7z x -y "%NASM_ZIP%" -o%TMP% >null
+- 7z x -y "%NASM_ZIP%.zip" -o%TMP% >null
 - robocopy /S /xx /ns /nc /nfl /ndl /np /njh /njs %TMP%\%NASM_ZIP% %MINGW_SDK% nasm.exe || exit 0
 
 - if not exist "%UPX_ZIP%.zip" appveyor DownloadFile "%UPX_URL%" -FileName "%UPX_ZIP%.zip"
-- 7z x -y "%UPX_ZIP%" -o%TMP% >null
+- 7z x -y "%UPX_ZIP%.zip" -o%TMP% >null
 - robocopy /S /xx /ns /nc /nfl /ndl /np /njh /njs %TMP%\%UPX_ZIP% %MINGW_SDK% upx.exe || exit 0
 
 - if not exist "%CCACHE_EXE%" appveyor DownloadFile "%CCACHE_URL%" -FileName "%CCACHE_EXE%"