diff --git a/google/cloud/discoveryengine/v1/grounded_generation_service.proto b/google/cloud/discoveryengine/v1/grounded_generation_service.proto
index 263374a0d1..8db4efdd15 100644
--- a/google/cloud/discoveryengine/v1/grounded_generation_service.proto
+++ b/google/cloud/discoveryengine/v1/grounded_generation_service.proto
@@ -213,7 +213,7 @@ message GenerateGroundedContentRequest {
   string location = 1 [
     (google.api.field_behavior) = REQUIRED,
     (google.api.resource_reference) = {
-      type: "locations.googleapis.com/Location"
+      type: "discoveryengine.googleapis.com/Location"
     }
   ];