diff --git a/.config/setup/02-setup-packages.sh b/.config/setup/02-setup-packages.sh
index 661ace0..093eccd 100755
--- a/.config/setup/02-setup-packages.sh
+++ b/.config/setup/02-setup-packages.sh
@@ -1,6 +1,6 @@
 #! /usr/bin/sh
 
-sudo usermod --append --groups docker ${USER}
+sudo usermod --append --groups docker "${USER}"
 
 systemctl --user enable syncthing.service
 systemctl --user start syncthing.service