diff --git a/testdata/a/schema/mutation.graphql b/testdata/a/schema/mutation.graphql
index fe0d074..7bafd7d 100644
--- a/testdata/a/schema/mutation.graphql
+++ b/testdata/a/schema/mutation.graphql
@@ -6,7 +6,7 @@ type Mutation {
 input MutationInput {
     name: String!
     id: ID! @id(kind: "Kind")
-    ids: ID! @id(kind: "Kind")
+    ids: [ID!]! @id(kind: "Kind")
 }
 
 type MutationPayload {