diff --git a/lambdas/indexer/app.py b/lambdas/indexer/app.py
index 0c8cab221..135deeb46 100644
--- a/lambdas/indexer/app.py
+++ b/lambdas/indexer/app.py
@@ -72,7 +72,7 @@
 class IndexerApp(AzulChaliceApp, SignatureHelper):
 
     @cached_property
-    def health_controller(self):
+    def health_controller(self) -> HealthController:
         return self._controller(HealthController, lambda_name='indexer')
 
     @cached_property