diff --git a/gtk/gtkborder.h b/gtk/gtkborder.h
index 6df53aac3e..adfa29e764 100644
--- a/gtk/gtkborder.h
+++ b/gtk/gtkborder.h
@@ -34,6 +34,8 @@
 
 G_BEGIN_DECLS
 
+typedef struct _GtkBorder GtkBorder;
+
 #define GTK_TYPE_BORDER (gtk_border_get_type ())
 
 /**
@@ -46,7 +48,13 @@ G_BEGIN_DECLS
  * A struct that specifies a border around a rectangular area
  * that can be of different width on each side.
  */
-typedef GdkBorder GtkBorder;
+struct _GtkBorder
+{
+  gint16 left;
+  gint16 right;
+  gint16 top;
+  gint16 bottom;
+};
 
 GDK_AVAILABLE_IN_ALL
 GType      gtk_border_get_type (void) G_GNUC_CONST;