diff --git a/packages/hydrooj/package.json b/packages/hydrooj/package.json
index 18cf11655..f95bb350d 100644
--- a/packages/hydrooj/package.json
+++ b/packages/hydrooj/package.json
@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "2.25.14",
+    "version": "2.25.15",
     "bin": "bin/hydrooj.js",
     "main": "dist/loader.js",
     "typings": "dist/loader.d.ts",
diff --git a/packages/hydrooj/src/handler/import.syzoj.ts b/packages/hydrooj/src/handler/import.syzoj.ts
index b5efa661b..e42495866 100644
--- a/packages/hydrooj/src/handler/import.syzoj.ts
+++ b/packages/hydrooj/src/handler/import.syzoj.ts
@@ -15,7 +15,7 @@ import { PERM } from '../model/builtin';
 import {
     Route, Handler, Types, post,
 } from '../service/server';
-import { isPid } from '../lib/validator';
+import { isPid, parsePid } from '../lib/validator';
 import download from '../lib/download';
 
 const RE_SYZOJ = /(https?):\/\/([^/]+)\/(problem|p)\/([0-9]+)\/?/i;
@@ -221,7 +221,7 @@ class ProblemImportSYZOJHandler extends Handler {
     }
 
     @post('url', Types.Content, true)
-    @post('pid', Types.Name, true, isPid)
+    @post('pid', Types.Name, true, isPid, parsePid)
     @post('hidden', Types.Boolean)
     @post('prefix', Types.Name, true)
     @post('start', Types.UnsignedInt, true)
diff --git a/packages/hydrooj/src/handler/problem.ts b/packages/hydrooj/src/handler/problem.ts
index 56351a371..dadae11da 100644
--- a/packages/hydrooj/src/handler/problem.ts
+++ b/packages/hydrooj/src/handler/problem.ts
@@ -11,7 +11,7 @@ import {
     ProblemDoc, User, RecordDoc, PathComponent, ProblemStatusDoc,
 } from '../interface';
 import paginate from '../lib/paginate';
-import { isPid } from '../lib/validator';
+import { isPid, parsePid as convertPid } from '../lib/validator';
 import difficultyAlgorithm from '../lib/difficulty';
 import { parseConfig } from '../lib/testdataConfig';
 import * as system from '../model/system';
@@ -358,7 +358,7 @@ export class ProblemEditHandler extends ProblemManageHandler {
     @route('pid', Types.Name, null, parsePid)
     @post('title', Types.Title)
     @post('content', Types.Content)
-    @post('pid', Types.Name, isPid, true)
+    @post('pid', Types.Name, isPid, convertPid, true)
     @post('hidden', Types.Boolean)
     @post('tag', Types.Content, true, null, parseCategory)
     async post(
@@ -600,7 +600,7 @@ export class ProblemCreateHandler extends Handler {
 
     @post('title', Types.Title)
     @post('content', Types.Content)
-    @post('pid', Types.Name, true, isPid)
+    @post('pid', Types.Name, true, isPid, convertPid)
     @post('hidden', Types.Boolean)
     @post('tag', Types.Content, true, null, parseCategory)
     async post(domainId: string, title: string, content: string, pid: string, hidden = false, tag: string[] = []) {
diff --git a/packages/hydrooj/src/lib/validator.ts b/packages/hydrooj/src/lib/validator.ts
index fd2af4d52..0dc1144b9 100644
--- a/packages/hydrooj/src/lib/validator.ts
+++ b/packages/hydrooj/src/lib/validator.ts
@@ -81,6 +81,8 @@ export const checkIntro = (s) => { if (!isIntro()) throw new ValidationError('in
 export const isDescription = (s: any) => s && s.length < 65536;
 export const checkDescription = (s) => { if (!(s && s.length < 65536)) throw new ValidationError('description'); else return s; };
 
+export const parsePid = (s) => (Number.isNaN(+s) ? s : `P${s}`);
+
 global.Hydro.lib.validator = {
     validate,
     isTitle,
@@ -105,4 +107,6 @@ global.Hydro.lib.validator = {
     checkIntro,
     isDescription,
     checkDescription,
+
+    parsePid,
 };