diff --git a/packages/hydrooj/package.json b/packages/hydrooj/package.json
index 713f977c9..61e01acb8 100644
--- a/packages/hydrooj/package.json
+++ b/packages/hydrooj/package.json
@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "3.5.2",
+    "version": "3.5.3",
     "bin": "bin/hydrooj.js",
     "main": "src/loader",
     "module": "src/loader",
diff --git a/packages/hydrooj/src/model/builtin.ts b/packages/hydrooj/src/model/builtin.ts
index a54039fe2..1dba5d9b1 100644
--- a/packages/hydrooj/src/model/builtin.ts
+++ b/packages/hydrooj/src/model/builtin.ts
@@ -58,7 +58,7 @@ export const PERM = {
     PERM_DELETE_DISCUSSION_REPLY: 1n << 38n,
     PERM_DELETE_DISCUSSION_REPLY_SELF: 1n << 39n,
     PERM_DELETE_DISCUSSION_REPLY_SELF_DISCUSSION: 1n << 40n,
-    PERM_LOCK_DISCUSSION: 64n,
+    PERM_LOCK_DISCUSSION: 1n << 64n,
 
     // Contest
     PERM_VIEW_CONTEST: 1n << 41n,