diff --git a/src/ParseServer.js b/src/ParseServer.js
index 081a8c15a4..31c1be4f03 100644
--- a/src/ParseServer.js
+++ b/src/ParseServer.js
@@ -270,7 +270,7 @@ class ParseServer {
         graphQLCustomTypeDefs = parse(
           fs.readFileSync(options.graphQLSchema, 'utf8')
         );
-      } else if (typeof options.graphQLSchema === 'object') {
+      } else if (typeof options.graphQLSchema === 'object' || typeof options.graphQLSchema === 'function') {
         graphQLCustomTypeDefs = options.graphQLSchema;
       }