diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 8202df7..84981d4 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -46,7 +46,7 @@ jobs:
       - name: Build FFmpeg
         shell: wsl-bash {0}
         run: |
-          VS=/mnt/c/Program\ Files\ \(x86\)/Microsoft\ Visual\ Studio/2019/Enterprise
+          export VS=/mnt/c/Program\ Files\ \(x86\)/Microsoft\ Visual\ Studio/2019/Enterprise
           PATH=$VS/VC/Tools/MSVC/14.29.30133/bin/Hostx64/x64:$VS/Common7/IDE/CommonExtensions/Microsoft/CMake/CMake/bin:$PATH
           #sudo apt -y install yasm
           mkdir build