diff --git a/services/frontend/src/lib/navigation.ts b/services/frontend/src/lib/navigation.ts
index b52eb057..62e9b5cb 100644
--- a/services/frontend/src/lib/navigation.ts
+++ b/services/frontend/src/lib/navigation.ts
@@ -75,6 +75,8 @@ export const mobileNavItems: NavItem[] = navItems.filter((item) =>
 export type NavItemId = (typeof navItems)[number]["href"];
 
 export function isActivePath(pathname: string, matchPrefix: string): boolean {
-  if (matchPrefix === "/dashboard") return pathname === "/dashboard";
-  return pathname.startsWith(matchPrefix);
+  // trailingSlash builds surface "/x/" via usePathname — normalize first.
+  const path = pathname.replace(/\/+$/, "") || "/";
+  if (matchPrefix === "/dashboard") return path === "/dashboard";
+  return path.startsWith(matchPrefix);
 }