diff --git a/src/qgcunittest/MockMavlinkFileServer.cc b/src/qgcunittest/MockMavlinkFileServer.cc
index abb53b5c9d7df332e76d6c649f3a9479f1dca2cc..0a39c4885e2662a054e250106ce7cb6828f5305a 100644
--- a/src/qgcunittest/MockMavlinkFileServer.cc
+++ b/src/qgcunittest/MockMavlinkFileServer.cc
@@ -97,6 +97,7 @@ void MockMavlinkFileServer::_openCommand(QGCUASFileManager::Request* request)
     
     size_t cchPath = strnlen((char *)request->data, sizeof(request->data));
     Q_ASSERT(cchPath != sizeof(request->data));
+    Q_UNUSED(cchPath); // Fix initialized-but-not-referenced warning on release builds
     path = (char *)request->data;
     
     // Check path against one of our known test cases