diff --git a/libgimpwidgets/gimpsizeentry.c b/libgimpwidgets/gimpsizeentry.c
index 91eb6a94cb..29c0a24603 100644
--- a/libgimpwidgets/gimpsizeentry.c
+++ b/libgimpwidgets/gimpsizeentry.c
@@ -321,12 +321,14 @@ gimp_size_entry_new (gint                       number_of_fields,
                 gsef->refval_digits : ((unit == GIMP_UNIT_PERCENT) ?
                                        2 : GIMP_SIZE_ENTRY_DIGITS (unit)));
 
-      gsef->value_spinbutton = gimp_spin_button_new ((GtkObject **) &gsef->value_adjustment,
-                                                     gsef->value,
-                                                     gsef->min_value,
-                                                     gsef->max_value,
-                                                     1.0, 10.0, 0.0,
-                                                     1.0, digits);
+      gsef->value_adjustment = (GtkAdjustment *)
+        gtk_adjustment_new (gsef->value,
+                            gsef->min_value, gsef->max_value,
+                            1.0, 10.0, 0.0);
+      gsef->value_spinbutton = gtk_spin_button_new (gsef->value_adjustment,
+                                                    1.0, digits);
+      gtk_spin_button_set_numeric (GTK_SPIN_BUTTON (gsef->value_spinbutton),
+                                   TRUE);
 
       gimp_size_entry_attach_eevl (GTK_SPIN_BUTTON (gsef->value_spinbutton),
                                    gsef);
@@ -352,11 +354,15 @@ gimp_size_entry_new (gint                       number_of_fields,
 
       if (gse->show_refval)
         {
-          gsef->refval_spinbutton =
-            gimp_spin_button_new ((GtkObject **) &gsef->refval_adjustment,
-                                  gsef->refval,
-                                  gsef->min_refval, gsef->max_refval,
-                                  1.0, 10.0, 0.0, 1.0, gsef->refval_digits);
+          gsef->refval_adjustment = (GtkAdjustment *)
+            gtk_adjustment_new (gsef->refval,
+                                gsef->min_refval, gsef->max_refval,
+                                1.0, 10.0, 0.0);
+          gsef->refval_spinbutton = gtk_spin_button_new (gsef->refval_adjustment,
+                                                         1.0,
+                                                         gsef->refval_digits);
+          gtk_spin_button_set_numeric (GTK_SPIN_BUTTON (gsef->refval_spinbutton),
+                                       TRUE);
 
           gtk_widget_set_size_request (gsef->refval_spinbutton,
                                        spinbutton_width, -1);