diff --git a/gtk/gtkspinbutton.c b/gtk/gtkspinbutton.c
index 97f076681b..bef3c0b49f 100644
--- a/gtk/gtkspinbutton.c
+++ b/gtk/gtkspinbutton.c
@@ -210,7 +210,6 @@ struct _GtkSpinButtonPrivate
 {
   GtkAdjustment *adjustment;
 
-  GtkWidget     *box;
   GtkWidget     *entry;
 
   GtkWidget     *up_button;