diff --git a/build_tools/osx_package_scripts/postinstall b/build_tools/osx_package_scripts/postinstall
index 544fd1de1..8a4ddbcf3 100755
--- a/build_tools/osx_package_scripts/postinstall
+++ b/build_tools/osx_package_scripts/postinstall
@@ -1,3 +1,5 @@
 #!/bin/sh -x
 
 ./add-shell /usr/local/bin/fish > /tmp/fish_postinstall_output.log
+killall fishd || true
+