diff --git a/featlib/docker.sh b/featlib/docker.sh
index deefb0d..2aa965b 100755
--- a/featlib/docker.sh
+++ b/featlib/docker.sh
@@ -5,7 +5,7 @@ function feat_addpacks_docker() {
 	if ! feat_missing "apt-get"; then
 		sudo apt-get remove docker docker-engine docker.io containerd runc
 		sudo apt-get update
-		if [ $(apt-cache search docker-ce | grep -o "^docker-ce ") != "docker-ce" ]; then
+		if [ "$(apt-cache search docker-ce | grep -o "^docker-ce ")" != "docker-ce" ]; then
 			sudo apt-get install \
 				apt-transport-https \
 				ca-certificates \