diff --git a/src/QGCMessageBox.h b/src/QGCMessageBox.h
index 54d54d8c3362a7a5980c11c9eba3cda2415f4d49..98717151380fa9f1915d423f948e1db7dbe7e78f 100644
--- a/src/QGCMessageBox.h
+++ b/src/QGCMessageBox.h
@@ -28,7 +28,9 @@
 
 #include "MainWindow.h"
 #include "QGCApplication.h"
+#ifdef QT_DEBUG
 #include "UnitTest.h"
+#endif
 
 /// @file
 ///     @brief Subclass of QMessageBox which re-implements the static public functions. There are two reasons for this: