diff --git a/script/alpine_setup b/script/alpine_setup
index f1c200a0..2501ed6f 100755
--- a/script/alpine_setup
+++ b/script/alpine_setup
@@ -17,7 +17,7 @@ apk upgrade
 
 apk add bash
 
-addgroup -g 8000 -S ${APP_GROUP}
-adduser -u 8010 -D -S -G ${APP_GROUP} ${APP_USER}
+addgroup -g 8000 -S "${APP_GROUP}"
+adduser -u 8010 -D -S -G "${APP_GROUP}" "${APP_USER}"
 
 echo 'gem: --no-document' > ~/.gemrc