diff --git a/gtk/gtkrange.c b/gtk/gtkrange.c
index 0bedf35e76..26f2fcea86 100644
--- a/gtk/gtkrange.c
+++ b/gtk/gtkrange.c
@@ -1837,7 +1837,7 @@ gtk_range_measure_trough (GtkCssGadget   *gadget,
   gint min, nat;
 
   gtk_css_gadget_get_preferred_size (priv->slider_gadget,
-                                     orientation, for_size,
+                                     orientation, -1,
                                      minimum, natural,
                                      NULL, NULL);