diff --git a/third-party/thrift/src/thrift/lib/cpp2/op/detail/ContainerPatch.h b/third-party/thrift/src/thrift/lib/cpp2/op/detail/ContainerPatch.h
index 15d6cdfbc29b4..1dbe8e07ec974 100644
--- a/third-party/thrift/src/thrift/lib/cpp2/op/detail/ContainerPatch.h
+++ b/third-party/thrift/src/thrift/lib/cpp2/op/detail/ContainerPatch.h
@@ -355,7 +355,7 @@ class MapPatch : public BaseContainerPatch<Patch, MapPatch<Patch>> {
   /// Ensures that key exists and patches the entry.
   template <typename K = typename T::key_type>
   FOLLY_NODISCARD VP& ensureAndPatchByKey(K&& key) {
-    add({{key, {}}});
+    tryPutMulti({{key, {}}});
     return patchByKey(key);
   }