diff --git a/config.sh b/config.sh
index aff0f47d2f9dad8c76138436e7ef0b3d0a16ad8e..5eaa1b27815a22ad9c290ca5d34cc9fd1e37a5e2 100755
--- a/config.sh
+++ b/config.sh
@@ -22,11 +22,11 @@ GIT_URL="https://gitlab.cvh-server.de/aco/"
 # This is the main compose file. Don not remove!
 # Required for unified a unified path layout.
 base_compose_file=" -f docker-compose.base.yml "
-DOCKER_COMPOSE_FILES=$base_compose_file
+DOCKER_COMPOSE_FILES="$base_compose_file"
 
 # Letsencrypt
 letsencrypt_compose_file=" -f letsencrypt-webserver/docker-compose.yml "
-$DOCKER_COMPOSE_FILES+=$letsencrypt_compose_file
+$DOCKER_COMPOSE_FILES+="$letsencrypt_compose_file"
 LETSENCRYPT_DIR=letsencrypt-webserver
 LETSENCRYPT_URL="$GIT_URL$LETSENCRYPT_DIR".git
 
@@ -35,7 +35,7 @@ JITSI_DIR=jitsi-auto-config
 JITSI_URL="$GIT_URL$JITSI_DIR".git
 if [ "$USE_JITSI" == "true" ]; then
 jitsi_compose_file=" -f jitsi/docker-compose.yml "
-$DOCKER_COMPOSE_FILES+=$jitsi_compose_file
+$DOCKER_COMPOSE_FILES+="$jitsi_compose_file"
 SUB_DOMAINS+="jitsi,"
 fi
 
@@ -44,7 +44,7 @@ NOVNC_DIR=novnc
 NOVNC_URL="$GIT_URL$NOVNC_DIR".git
 if [ "$USE_NO_VNC" == "true" ]; then
 novnc_compose_file=" -f ./novnc/docker-compose.yml "
-$DOCKER_COMPOSE_FILES+=$novnc_compose_file
+$DOCKER_COMPOSE_FILES+="$novnc_compose_file"
 fi
 
 # Mumble
@@ -52,6 +52,6 @@ MUMBLE_DIR=build-mumble-web
 MUMBLE_URL=https://github.com/Johni0702/mumble-web.git
 if [ "$USE_MUMBLE" == "true" ]; then
 mumble_compose_file=" -f ./build-mumble-web/docker-compose.production.yml"
-$DOCKER_COMPOSE_FILES+=$mumble_compose_file
+$DOCKER_COMPOSE_FILES+="$mumble_compose_file"
 SUB_DOMAINS+="mumble-web"
 fi