diff --git a/site/graphql-js/APIReference-TypeSystem.md b/site/graphql-js/APIReference-TypeSystem.md
index ac21fabf8b..0a7ff72520 100644
--- a/site/graphql-js/APIReference-TypeSystem.md
+++ b/site/graphql-js/APIReference-TypeSystem.md
@@ -461,7 +461,7 @@ var RGBType = new GraphQLEnumType({
 
 ```js
 class GraphQLInputObjectType {
-  constructor(config: GraphQLInputObjectTypeConfig)
+  constructor(config: GraphQLInputObjectConfig)
 }
 
 type GraphQLInputObjectConfig = {