diff --git a/packages/hydrooj/package.json b/packages/hydrooj/package.json
index 5369f0042..be121fe80 100644
--- a/packages/hydrooj/package.json
+++ b/packages/hydrooj/package.json
@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "3.3.5",
+    "version": "3.3.6",
     "bin": "bin/hydrooj.js",
     "main": "src/loader",
     "module": "src/loader",
diff --git a/packages/hydrooj/src/model/problem.ts b/packages/hydrooj/src/model/problem.ts
index 382e39cc7..463279df6 100644
--- a/packages/hydrooj/src/model/problem.ts
+++ b/packages/hydrooj/src/model/problem.ts
@@ -31,7 +31,7 @@ export class ProblemModel {
     static PROJECTION_LIST: Field[] = [
         '_id', 'domainId', 'docType', 'docId', 'pid',
         'owner', 'title', 'nSubmit', 'nAccept', 'difficulty',
-        'tag', 'assign', 'stats',
+        'tag', 'hidden', 'assign', 'stats',
     ];
 
     static PROJECTION_PUBLIC: Field[] = [