diff --git a/gtkglext/gtkmm/gl/drawingarea.cc b/gtkglext/gtkmm/gl/drawingarea.cc
index 82bb7f4..5a8c5e3 100644
--- a/gtkglext/gtkmm/gl/drawingarea.cc
+++ b/gtkglext/gtkmm/gl/drawingarea.cc
@@ -17,6 +17,7 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA.
  */
 
+#include <glibmm.h>
 #include "drawingarea.h"
 
 namespace Gtk
diff --git a/gtkglext/gtkmm/gl/widget.cc b/gtkglext/gtkmm/gl/widget.cc
index 598d6e2..2d6833b 100644
--- a/gtkglext/gtkmm/gl/widget.cc
+++ b/gtkglext/gtkmm/gl/widget.cc
@@ -17,6 +17,7 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA.
  */
 
+#include <glibmm.h>
 #include "widget.h"
 
 #include <gtk/gtkglwidget.h>