diff --git a/src/stitching/mergeSchemas.ts b/src/stitching/mergeSchemas.ts
index 8cbc632001f..8a0f4e84809 100644
--- a/src/stitching/mergeSchemas.ts
+++ b/src/stitching/mergeSchemas.ts
@@ -71,7 +71,9 @@ export default function mergeSchemas({
           parsedSchemaDocument,
           backcompatOptions,
         );
-        actualSchemas.push(actualSchema);
+        if (actualSchema.getQueryType()) {
+          actualSchemas.push(actualSchema);
+        }
       } catch (e) {
         typeFragments.push(parsedSchemaDocument);
       }
diff --git a/src/test/testMergeSchemas.ts b/src/test/testMergeSchemas.ts
index 01df3ef40a7..62c7f9dc1a5 100644
--- a/src/test/testMergeSchemas.ts
+++ b/src/test/testMergeSchemas.ts
@@ -112,6 +112,12 @@ const linkSchema = `
   extend type Customer implements Node ${graphql11compat}
 `;
 
+const loneExtend = `
+  extend type Booking {
+    foo: String!
+  }
+`;
+
 testCombinations.forEach(async combination => {
   describe('merging ' + combination.name, () => {
     let mergedSchema: GraphQLSchema,
@@ -129,6 +135,7 @@ testCombinations.forEach(async combination => {
           scalarTest,
           enumTest,
           linkSchema,
+          loneExtend,
           localSubscriptionSchema,
         ],
         resolvers: {