diff --git a/libuavcan/test/transport/transfer_test_helpers.hpp b/libuavcan/test/transport/transfer_test_helpers.hpp
index 57853f688c..c1edc7b8f6 100644
--- a/libuavcan/test/transport/transfer_test_helpers.hpp
+++ b/libuavcan/test/transport/transfer_test_helpers.hpp
@@ -72,6 +72,7 @@ struct Transfer
             (transfer_id   == rhs.transfer_id) &&
             (src_node_id   == rhs.src_node_id) &&
             (dst_node_id.isValid() ? (dst_node_id == rhs.dst_node_id) : true) &&
+            (data_type     == rhs.data_type) &&
             (payload       == rhs.payload);
     }