diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 2cad7cf3..4aabf581 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -41,6 +41,7 @@ jobs:
       run: |
         brew install switchaudio-osx
         brew install blackhole-2ch
+        killall coreaudiod
         sleep 10
         SwitchAudioSource -s "BlackHole 2ch" -t input
         SwitchAudioSource -s "BlackHole 2ch" -t output