diff --git a/CI/mac/before_install.sh b/CI/mac/before_install.sh
index 8a440f565..34e34d390 100644
--- a/CI/mac/before_install.sh
+++ b/CI/mac/before_install.sh
@@ -5,4 +5,4 @@ brew update
 brew install smpeg2 libpng freetype qt5 ffmpeg ninja boost tbb luajit
 brew install sdl2 sdl2_ttf sdl2_image sdl2_mixer
 
-echo CMAKE_PREFIX_PATH="/usr/local/opt/ffmpeg@4:/usr/local/opt/qt5:$CMAKE_PREFIX_PATH" >> $GITHUB_ENV
+echo CMAKE_PREFIX_PATH="$(brew --prefix)/opt/ffmpeg@4:$(brew --prefix)/opt/qt5:$CMAKE_PREFIX_PATH" >> $GITHUB_ENV