diff --git a/libs/gtkmm2ext/gtkmm2ext/cell_renderer_color_selector.h b/libs/gtkmm2ext/gtkmm2ext/cell_renderer_color_selector.h
index 2a24347528..0958010492 100644
--- a/libs/gtkmm2ext/gtkmm2ext/cell_renderer_color_selector.h
+++ b/libs/gtkmm2ext/gtkmm2ext/cell_renderer_color_selector.h
@@ -26,8 +26,6 @@
 
 #include "gtkmm2ext/visibility.h"
 
-using namespace Gtk;
-
 namespace Gtk {
 	class ColorSelectionDialog;
 }
diff --git a/libs/gtkmm2ext/gtkmm2ext/cell_renderer_pixbuf_multi.h b/libs/gtkmm2ext/gtkmm2ext/cell_renderer_pixbuf_multi.h
index 2922f329b3..57fdfdd3e8 100644
--- a/libs/gtkmm2ext/gtkmm2ext/cell_renderer_pixbuf_multi.h
+++ b/libs/gtkmm2ext/gtkmm2ext/cell_renderer_pixbuf_multi.h
@@ -30,8 +30,6 @@
 
 #include "gtkmm2ext/visibility.h"
 
-using namespace Gtk;
-
 namespace Gtkmm2ext {
 
 class LIBGTKMM2EXT_API CellRendererPixbufMulti : public Gtk::CellRenderer
diff --git a/libs/gtkmm2ext/gtkmm2ext/cell_renderer_pixbuf_toggle.h b/libs/gtkmm2ext/gtkmm2ext/cell_renderer_pixbuf_toggle.h
index 0608f5c053..1af13bd84b 100644
--- a/libs/gtkmm2ext/gtkmm2ext/cell_renderer_pixbuf_toggle.h
+++ b/libs/gtkmm2ext/gtkmm2ext/cell_renderer_pixbuf_toggle.h
@@ -27,8 +27,6 @@
 
 #include "gtkmm2ext/visibility.h"
 
-using namespace Gtk;
-
 namespace Gtkmm2ext {
 
 class LIBGTKMM2EXT_API CellRendererPixbufToggle : public Gtk::CellRenderer