diff --git a/src/middleware/sluggifyMiddleware.js b/src/middleware/sluggifyMiddleware.js
index e187aa797..2276e6373 100644
--- a/src/middleware/sluggifyMiddleware.js
+++ b/src/middleware/sluggifyMiddleware.js
@@ -16,7 +16,7 @@ const isUniqueFor = (context, type) => {
 export default {
   Mutation: {
     CreatePost: async (resolve, root, args, context, info) => {
-      args.slug = await uniqueSlug(args.title, isUniqueFor(context, 'Post'))
+      args.slug = args.slug || await uniqueSlug(args.title, isUniqueFor(context, 'Post'))
       const result = await resolve(root, args, context, info)
       return result
     },
diff --git a/src/middleware/slugifyMiddleware.spec.js b/src/middleware/slugifyMiddleware.spec.js
index 00382ffb9..0088d7d11 100644
--- a/src/middleware/slugifyMiddleware.spec.js
+++ b/src/middleware/slugifyMiddleware.spec.js
@@ -53,7 +53,7 @@ describe('slugify', () => {
                 slug: "pre-existing-post"
               ) { slug }
             }`)
-          ).rejects.toThrow('Unique constraint error')
+          ).rejects.toThrow('already exists')
         })
       })
     })