diff --git a/ts/test-node/util/signalRoutes_test.ts b/ts/test-node/util/signalRoutes_test.ts
index b87d3e25fe..52b028b6b9 100644
--- a/ts/test-node/util/signalRoutes_test.ts
+++ b/ts/test-node/util/signalRoutes_test.ts
@@ -119,6 +119,17 @@ describe('signalRoutes', () => {
     check(`signalcaptcha://${captchaId}`, result);
   });
 
+  it('captcha with a trailing slash', () => {
+    const captchaId =
+      'signal-hcaptcha.Foo-bAr_baz.challenge.fOo-bAR_baZ.fOO-BaR_baz';
+    const result: ParsedSignalRoute = {
+      key: 'captcha',
+      args: { captchaId },
+    };
+    const check = createCheck({ hasWebUrl: false });
+    check(`signalcaptcha://${captchaId}/`, result);
+  });
+
   it('linkCall', () => {
     const result: ParsedSignalRoute = {
       key: 'linkCall',
diff --git a/ts/util/signalRoutes.ts b/ts/util/signalRoutes.ts
index 11d25e49dc..72715b1d21 100644
--- a/ts/util/signalRoutes.ts
+++ b/ts/util/signalRoutes.ts
@@ -347,7 +347,7 @@ export const linkDeviceRoute = _route('linkDevice', {
  */
 export const captchaRoute = _route('captcha', {
   // needs `(.+)` to capture `.` in hostname
-  patterns: [_pattern('signalcaptcha:', ':captchaId(.+)', '', {})],
+  patterns: [_pattern('signalcaptcha:', ':captchaId(.+)', '{/}?', {})],
   schema: z.object({
     captchaId: paramSchema, // opaque
   }),