diff --git a/packages/prom-client/metrics.ts b/packages/prom-client/metrics.ts
index b4eea1325..dff886045 100644
--- a/packages/prom-client/metrics.ts
+++ b/packages/prom-client/metrics.ts
@@ -40,7 +40,7 @@ export function createRegistry(ctx: Context) {
     const submissionCounter = createMetric(Counter, 'hydro_submission', 'submissioncount', {
         labelNames: ['lang', 'domainId'],
     });
-    ctx.on('handler/after/ProblemSubmit', (that) => {
+    ctx.on('handler/after/ProblemSubmit#post', (that) => {
         submissionCounter.inc({ lang: that.args.lang, domainId: that.args.domainId });
     });