diff --git a/bin/vps b/bin/vps
index 184dc24..3191b9f 100755
--- a/bin/vps
+++ b/bin/vps
@@ -630,7 +630,7 @@ compose:container:service() {
 export -f compose:container:service
 
 compose:psql() {
-    local project_name="$1" dbname="$2"
+    local project_name="$1" dbname="$2" container_id
     container_id=$(compose:charm:container_one "$project_name" "postgres") || return 1
     docker exec -i "${container_id}" psql -U postgres "$dbname"
 }