diff --git a/src/platform/guigtk.cpp b/src/platform/guigtk.cpp
index 6afb9c7..1a11582 100644
--- a/src/platform/guigtk.cpp
+++ b/src/platform/guigtk.cpp
@@ -33,6 +33,7 @@
 
 #if defined(HAVE_SPACEWARE)
 #   include <spnav.h>
+#   include <gdk/gdk.h>
 #   if defined(GDK_WINDOWING_X11)
 #       include <gdk/gdkx.h>
 #   endif