diff --git a/debian/postinst b/debian/postinst
index 98bba751ea..4405beaca8 100755
--- a/debian/postinst
+++ b/debian/postinst
@@ -39,7 +39,7 @@ case "$1" in
 	chown -R ${gitlab_user}: ${gitlab_data_dir}
 
 	chown -R ${gitlab_user}: /usr/share/gitlab-shell
-	su ${gitlab_user} -s /bin/sh -s 'mkdir -m 750 ${gitlab_home}/public/uploads'
+	su ${gitlab_user} -s /bin/sh -s "mkdir -m 750 ${gitlab_home}/public/uploads"
 	su ${gitlab_user} -H -s /bin/sh -c 'git config --global core.autocrlf "input"'
 	cd ${gitlab_home}
 	# Show debconf questions