diff --git a/app/SysTray-X/SysTray-X-app/preferencesdialog.cpp b/app/SysTray-X/SysTray-X-app/preferencesdialog.cpp
index e989ea6..7b28040 100644
--- a/app/SysTray-X/SysTray-X-app/preferencesdialog.cpp
+++ b/app/SysTray-X/SysTray-X-app/preferencesdialog.cpp
@@ -11,6 +11,8 @@
  */
 #include <QColor>
 #include <QPixmap>
+#include <QEvent>
+#include <QKeyEvent>
 #include <QFileDialog>
 #include <QColorDialog>
 #include <QMimeDatabase>
diff --git a/app/SysTray-X/SysTray-X-app/preferencesdialog.h b/app/SysTray-X/SysTray-X-app/preferencesdialog.h
index 01edd9b..6d0ae22 100644
--- a/app/SysTray-X/SysTray-X-app/preferencesdialog.h
+++ b/app/SysTray-X/SysTray-X-app/preferencesdialog.h
@@ -16,6 +16,8 @@
  *	Predefines
  */
 class SysTrayXLink;
+class QEvent;
+class QKeyEvent;
 
 /*
  *  Namespace