diff --git a/lib/iris/common/metadata.py b/lib/iris/common/metadata.py
index 6f3e455b4d..8705c79816 100644
--- a/lib/iris/common/metadata.py
+++ b/lib/iris/common/metadata.py
@@ -28,6 +28,8 @@
     "CoordMetadata",
     "CubeMetadata",
     "DimCoordMetadata",
+    "MeshCoordMetadata",
+    "MeshMetadata",
     "SERVICES",
     "SERVICES_COMBINE",
     "SERVICES_DIFFERENCE",