diff --git a/apps/builder/app/builder/shared/url-pattern.test.ts b/apps/builder/app/builder/shared/url-pattern.test.ts
index a0157cdba2..2b450a16e2 100644
--- a/apps/builder/app/builder/shared/url-pattern.test.ts
+++ b/apps/builder/app/builder/shared/url-pattern.test.ts
@@ -216,3 +216,9 @@ test(`forbid named group with static parts before or after`, () => {
     `Static parts cannot be mixed with dynamic parameters at 'prefix-:id-suffix'.`,
   ]);
 });
+
+test(`? should be allowed in named groups only`, () => {
+  expect(validatePathnamePattern("/name?")).toEqual([
+    `Optional parameter indicator ? must be at the end of the named parameter. Correct usage: /:param?`,
+  ]);
+});
diff --git a/apps/builder/app/builder/shared/url-pattern.ts b/apps/builder/app/builder/shared/url-pattern.ts
index 6598eae203..996e0c6c33 100644
--- a/apps/builder/app/builder/shared/url-pattern.ts
+++ b/apps/builder/app/builder/shared/url-pattern.ts
@@ -147,6 +147,10 @@ export const validatePathnamePattern = (pathname: string) => {
           `Static parts cannot be mixed with dynamic parameters at '${segment}'.`
         );
       }
+    } else if (segment.includes("?")) {
+      messages.push(
+        `Optional parameter indicator ? must be at the end of the named parameter. Correct usage: /:param?`
+      );
     }
   }