1 files changed, 6 insertions, 2 deletions
diff --git a/src/widgets/toolbox.h b/src/widgets/toolbox.h
index 9c839a8fe..e9ffcda4a 100644
--- a/src/widgets/toolbox.h
+++ b/src/widgets/toolbox.h
@@ -23,11 +23,15 @@
 #define TOOLBAR_SLIDER_HINT "full"
 
 class SPDesktop;
-struct SPEventContext;
+class SPEventContext;
 
 namespace Inkscape {
 namespace UI {
 
+namespace Widget {
+    class UnitTracker;
+}
+
 /**
  * Main toolbox source.
  */
@@ -118,12 +122,12 @@ void delete_connection(GObject * /*obj*/, sigc::connection *connection);
                                                        gchar const *label, gchar const *shortLabel, gchar const *tooltip,
                                                        Glib::ustring const &path, gdouble def,
                                                        GtkWidget *focusTarget,
-                                                       GtkWidget *us,
                                                        GObject *dataKludge,
                                                        gboolean altx, gchar const *altx_mark,
                                                        gdouble lower, gdouble upper, gdouble step, gdouble page,
                                                        gchar const** descrLabels, gdouble const* descrValues, guint descrCount,
                                                        void (*callback)(GtkAdjustment *, GObject *),
+                                                       Inkscape::UI::Widget::UnitTracker *unit_tracker = NULL,
                                                        gdouble climb = 0.1, guint digits = 3, double factor = 1.0 );
 
 #endif /* !SEEN_TOOLBOX_H */