diff --git a/frontend/src/pages/ProactiveAISettings.tsx b/frontend/src/pages/ProactiveAISettings.tsx
index 3e853b7..3182578 100644
--- a/frontend/src/pages/ProactiveAISettings.tsx
+++ b/frontend/src/pages/ProactiveAISettings.tsx
@@ -172,7 +172,7 @@ export function ProactiveAISettings() {
             <span
               className={`inline-block h-4 w-4 transform rounded-full bg-white transition-transform ${
                 settings.heartbeat_enabled ? 'translate-x-6' : 'translate-x-1'
-              }`
+              }`}
             />
           </button>
         </div>