diff --git a/sources/elementdialog.cpp b/sources/elementdialog.cpp
index de94de0be..8f5da2974 100644
--- a/sources/elementdialog.cpp
+++ b/sources/elementdialog.cpp
@@ -15,6 +15,12 @@
 	You should have received a copy of the GNU General Public License
 	along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
 */
+#include <QVBoxLayout>
+#include <QLabel>
+#include <QTreeView>
+#include <QDialogButtonBox>
+#include <QPushButton>
+
 #include "elementdialog.h"
 #include "qetapp.h"
 #include "qfilenameedit.h"
diff --git a/sources/qetapp.h b/sources/qetapp.h
index 4f1e283c2..0eac55eac 100644
--- a/sources/qetapp.h
+++ b/sources/qetapp.h
@@ -17,13 +17,21 @@
 */
 #ifndef QET_APP_H
 #define QET_APP_H
-#include "qetsingleapplication.h"
+
 #include <QTranslator>
-#include <QtWidgets>
+#include <QSystemTrayIcon>
+#include <QPalette>
+
+#include "qetsingleapplication.h"
 #include "elementslocation.h"
 #include "templatelocation.h"
 #include "qetarguments.h"
 
+class QSplashScreen;
+class QMenu;
+class QAction;
+class QMainWindow;
+
 #define QETAPP_COMMON_TBT_PROTOCOL "commontbt"
 #define QETAPP_CUSTOM_TBT_PROTOCOL "customtbt"
 
diff --git a/sources/qetmainwindow.cpp b/sources/qetmainwindow.cpp
index 2f8e4cc21..196030d67 100644
--- a/sources/qetmainwindow.cpp
+++ b/sources/qetmainwindow.cpp
@@ -15,6 +15,12 @@
 	You should have received a copy of the GNU General Public License
 	along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
 */
+#include <QAction>
+#include <QWhatsThis>
+#include <QMenu>
+#include <QMenuBar>
+#include <QDragEnterEvent>
+
 #include "qetmainwindow.h"
 #include "qeticons.h"
 #include "qetapp.h"