diff --git a/src/qprojectM/QProjectMConfigDialog.hpp b/src/qprojectM/QProjectMConfigDialog.hpp
index 08b14335d..6e63da34b 100644
--- a/src/qprojectM/QProjectMConfigDialog.hpp
+++ b/src/qprojectM/QProjectMConfigDialog.hpp
@@ -1,4 +1,5 @@
 #ifndef QPROJECTM_CONFIG_DIALOG_HPP
+#define QPROJECTM_CONFIG_DIALOG_HPP
 #include "ui_QProjectMConfigDialog.h"
 #include "QProjectM_MainWindow.hpp"