diff --git a/src/core/QueryManager.ts b/src/core/QueryManager.ts
index bf9c6613d4d..12db6daa4df 100644
--- a/src/core/QueryManager.ts
+++ b/src/core/QueryManager.ts
@@ -25,6 +25,7 @@ import {
   makeUniqueId,
   isDocumentNode,
   isNonNullObject,
+  cloneDeep,
 } from '../utilities';
 import { ApolloError, isApolloError } from '../errors';
 import {
@@ -1034,6 +1035,10 @@ export class QueryManager<TStore> {
   ): Observable<ApolloQueryResult<TData>> {
     const requestId = queryInfo.lastRequestId = this.generateRequestId();
 
+    // Make sure we write the result below using the same options we were given,
+    // even though the input object may have been modified in the meantime.
+    options = cloneDeep(options);
+
     return asyncMap(
       this.getObservableFromLink(
         queryInfo.document!,