diff --git a/packages/grpc-js-xds/src/xds-stream-state/rds-state.ts b/packages/grpc-js-xds/src/xds-stream-state/rds-state.ts
index 9441a7ec..0322218d 100644
--- a/packages/grpc-js-xds/src/xds-stream-state/rds-state.ts
+++ b/packages/grpc-js-xds/src/xds-stream-state/rds-state.ts
@@ -141,7 +141,12 @@ export class RdsState implements XdsStreamState<RouteConfiguration__Output> {
           return false;
         }
         if (EXPERIMENTAL_FAULT_INJECTION) {
-          for (const filterConfig of Object.values(route.typed_per_filter_config ?? {})) {
+          const filterNames = new Set<string>();
+          for (const [name, filterConfig] of Object.entries(route.typed_per_filter_config ?? {})) {
+            if (filterNames.has(name)) {
+              return false;
+            }
+            filterNames.add(name);
             if (!validateOverrideFilter(filterConfig)) {
               return false;
             }