diff --git a/src/gui/panels/panel.hpp b/src/gui/panels/panel.hpp
index 1a9801250..a6f508403 100644
--- a/src/gui/panels/panel.hpp
+++ b/src/gui/panels/panel.hpp
@@ -27,11 +27,12 @@
 #ifndef PANEL_HPP
 #define PANEL_HPP
 
-#include <gdl/gdl-dock-item.h>
 
 #include "gui/gtk-lumiera.hpp"
 #include "gui/widgets/panel-bar.hpp"
 
+#include <gdl/gdl-dock-item.h>
+
 namespace gui {
 
 namespace workspace {
diff --git a/src/gui/panels/viewer-panel.cpp b/src/gui/panels/viewer-panel.cpp
index 692f82308..955b92e3e 100644
--- a/src/gui/panels/viewer-panel.cpp
+++ b/src/gui/panels/viewer-panel.cpp
@@ -21,13 +21,13 @@
 * *****************************************************/
 
 #include "gui/gtk-lumiera.hpp"
+#include "gui/panels/viewer-panel.hpp"
 
+#include "gui/workspace/workspace-window.hpp"
 #include "gui/controller/controller.hpp"
 #include "gui/controller/playback-controller.hpp"
 #include "gui/display-service.hpp"
-#include "gui/workspace/workspace-window.hpp"
 
-#include "viewer-panel.hpp"
 
 using namespace Gtk;
 using namespace gui::widgets;
diff --git a/src/gui/panels/viewer-panel.hpp b/src/gui/panels/viewer-panel.hpp
index ae41516c1..7fe5cace3 100644
--- a/src/gui/panels/viewer-panel.hpp
+++ b/src/gui/panels/viewer-panel.hpp
@@ -26,11 +26,12 @@
 #ifndef VIEWER_PANEL_HPP
 #define VIEWER_PANEL_HPP
 
-#include <gtkmm.h>
 
-#include "panel.hpp"
+#include "gui/panels/panel.hpp"
 #include "gui/widgets/video-display-widget.hpp"
 
+#include <gtkmm.h>
+
 namespace gui {
 namespace panels {