diff --git a/scripts/run_vim.sh b/scripts/run_vim.sh
index 1f3edea..6a129f5 100644
--- a/scripts/run_vim.sh
+++ b/scripts/run_vim.sh
@@ -21,4 +21,5 @@ done
 
 # Run as the vimtest user.  This is not really for security.  It is for running
 # Vim as a user that's unable to write to your volume.
-exec su -l vimtest -c "cd /testplugin && /vim-build/bin/$BIN $ARGS"
+cd /testplugin || exit
+exec su -l vimtest -c "env HOME=/tmp/vimtestbed-home /vim-build/bin/$BIN $ARGS"