diff --git a/packages/ui-default/package.json b/packages/ui-default/package.json
index fbf6ec8d..bf604590 100644
--- a/packages/ui-default/package.json
+++ b/packages/ui-default/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@hydrooj/ui-default",
-  "version": "4.39.3",
+  "version": "4.39.4",
   "author": "undefined <i@undefined.moe>",
   "license": "AGPL-3.0",
   "main": "hydro.js",
diff --git a/packages/ui-default/templates/components/problem.html b/packages/ui-default/templates/components/problem.html
index d81ca436..efad65ef 100644
--- a/packages/ui-default/templates/components/problem.html
+++ b/packages/ui-default/templates/components/problem.html
@@ -6,7 +6,7 @@
   <a href="{{ url('problem_detail', _linkArgs) }}"{% if small %} data-tooltip="{{ pdoc.title }}"{% endif %}>
 {%- endif -%}
 {%- if pdoc.domainId !== handler.args.domainId -%}<b>{{ pdoc.domainId }}#</b>{%- endif -%}
-<b>{{ pdoc.pid or 'P'+pdoc.docId if pdoc.domainId === handler.args.domainId else pdoc.docId }}</b>
+<b>{{ pdoc.pid or ('P'+pdoc.docId if pdoc.domainId === handler.args.domainId else pdoc.docId) }}</b>
 {%- if not small -%}&nbsp;&nbsp;{{ pdoc.title }}{%- endif -%}
 {%- if not invalid -%}
   </a>