diff --git a/src/qgcunittest/MockMavlinkFileServer.cc b/src/qgcunittest/MockMavlinkFileServer.cc
index 9d5e52bce80c48d889d7e590cc25e47330b7d0d3..8fba0b29013e4b6c9fe9a56ae5b85b142407300b 100644
--- a/src/qgcunittest/MockMavlinkFileServer.cc
+++ b/src/qgcunittest/MockMavlinkFileServer.cc
@@ -235,6 +235,7 @@ void MockMavlinkFileServer::sendMessage(mavlink_message_t message)
 
     // Validate CRC
     if (request->hdr.crc32 != QGCUASFileManager::crc32(request)) {
+        qDebug() << "Bad CRC received - opcode:" << request->hdr.opcode << "expected:" << request->hdr.crc32 << "actual:" << QGCUASFileManager::crc32(request);
         _sendNak(QGCUASFileManager::kErrCrc, outgoingSeqNumber);
     }