diff --git a/test/test_rdm.cpp b/test/test_rdm.cpp
index e06ac9d..a47545f 100644
--- a/test/test_rdm.cpp
+++ b/test/test_rdm.cpp
@@ -48,7 +48,10 @@ TEST(RDM, device_info)
     rdm_data.push_back(RDM::GET_COMMAND); // command class
     RDM::Message::writeType<uint16_t>(rdm_data, RDM::DEVICE_INFO.pid); // parameter ID
     rdm_data.push_back(0);                   // Parameter Data Length
-    RDM::Message::writeType<uint16_t>(rdm_data, RDM::Message::checksum(rdm_data)); // checksum
+    uint16_t csum = 0;
+    for (const auto byte : rdm_data)
+        csum += byte;
+    RDM::Message::writeType<uint16_t>(rdm_data, csum);
 
     EXPECT_EQ(rdm_data.size(), 26) << "mallformed DEVICE_INFO GET_COMMAND";
     responder.receive(rdm_data);