diff --git a/packages/hydrooj/package.json b/packages/hydrooj/package.json
index e1a9d9476..202f534ec 100644
--- a/packages/hydrooj/package.json
+++ b/packages/hydrooj/package.json
@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "3.15.12",
+    "version": "3.15.13",
     "bin": "bin/hydrooj.js",
     "main": "src/loader",
     "module": "src/loader",
diff --git a/packages/hydrooj/src/lib/content.ts b/packages/hydrooj/src/lib/content.ts
index eeaeccf85..f0bde0edc 100644
--- a/packages/hydrooj/src/lib/content.ts
+++ b/packages/hydrooj/src/lib/content.ts
@@ -60,7 +60,7 @@ export function buildContent(source: ProblemSource | ContentNode[], type: 'markd
         : [
             ...source.description ? [`## ${_('Description')}`, source.description] : [],
             ...source.input ? [`## ${_('Input Format')}`, source.input] : [],
-            ...source.output ? [`## '${_('Output Format')}`, source.output] : [],
+            ...source.output ? [`## ${_('Output Format')}`, source.output] : [],
             ...(source.samples).map((sample, i) => [
                 `\`\`\`input${i + 1}`,
                 sample[0],