diff --git a/pages/api/collection-by-id/[id].ts b/pages/api/collection-by-id/[id].ts
index c6f792ee1..9d0a0ee10 100644
--- a/pages/api/collection-by-id/[id].ts
+++ b/pages/api/collection-by-id/[id].ts
@@ -70,11 +70,11 @@ export async function getCollection(props: GetCollectionProps): Promise<Collecti
 export async function getCollections({
   includeDraft,
   matchQuery,
-  reqUser,
   populateAroundId,
   populateAroundSlug,
   populateLevelData = true,
   populateLevelDirection,
+  reqUser,
 }: GetCollectionProps): Promise<Collection[]> {
   const populateLevelCount = 5;
   const collectionAgg = await CollectionModel.aggregate<EnrichedCollection>(([
@@ -208,7 +208,13 @@ export async function getCollections({
           $size: '$levels'
         },
         userSolvedCount: {
-          $sum: '$levels.complete'
+          $size: {
+            $filter: {
+              input: '$levels',
+              as: 'level',
+              cond: { $eq: ['$$level.complete', true] }
+            }
+          }
         }
       }
     },