diff --git a/.changeset/chilly-jars-sort.md b/.changeset/chilly-jars-sort.md
new file mode 100644
index 000000000..f9aa4bf8a
--- /dev/null
+++ b/.changeset/chilly-jars-sort.md
@@ -0,0 +1,5 @@
+---
+'backend': patch
+---
+
+use index when querying events by userAddress
diff --git a/modules/controllers/event-query-controller.ts b/modules/controllers/event-query-controller.ts
index b4a390d22..b0b0dc07d 100644
--- a/modules/controllers/event-query-controller.ts
+++ b/modules/controllers/event-query-controller.ts
@@ -124,8 +124,7 @@ export function EventsQueryController(tracer?: any) {
 
             if (userAddress) {
                 conditions.userAddress = {
-                    equals: userAddress,
-                    mode: 'insensitive',
+                    equals: userAddress.toLowerCase(),
                 };
             }