diff --git a/mypy.ini b/mypy.ini
index 4c35cf1d53e..fe03c3bbe12 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -19,3 +19,7 @@ exclude= cylc/flow/etc/tutorial/.*
 # Suppress the following messages:
 # By default the bodies of untyped functions are not checked, consider using --check-untyped-defs
 disable_error_code = annotation-unchecked
+
+# For some reason, couldn't exclude this with the exclude directive above
+[mypy-cylc.flow.data_messages_pb2]
+ignore_errors = True