diff --git a/app/widgets/gimpprefsbox.h b/app/widgets/gimpprefsbox.h
index ebab598b99..e33a50f822 100644
--- a/app/widgets/gimpprefsbox.h
+++ b/app/widgets/gimpprefsbox.h
@@ -48,16 +48,16 @@ GType       gimp_prefs_box_get_type            (void) G_GNUC_CONST;
 GtkWidget * gimp_prefs_box_new                 (void);
 
 GtkWidget * gimp_prefs_box_add_page            (GimpPrefsBox *box,
-						const gchar  *icon_name,
-						const gchar  *notebook_label,
-						const gchar  *tree_label,
-						const gchar  *help_id,
-						GtkTreeIter  *parent,
-						GtkTreeIter  *iter);
+                                                const gchar  *icon_name,
+                                                const gchar  *notebook_label,
+                                                const gchar  *tree_label,
+                                                const gchar  *help_id,
+                                                GtkTreeIter  *parent,
+                                                GtkTreeIter  *iter);
 
 void        gimp_prefs_box_set_page_scrollable (GimpPrefsBox *box,
-						GtkWidget    *page,
-						gboolean      scrollable);
+                                                GtkWidget    *page,
+                                                gboolean      scrollable);
 
 GtkWidget * gimp_prefs_box_get_tree_view       (GimpPrefsBox *box);
 GtkWidget * gimp_prefs_box_get_notebook        (GimpPrefsBox *box);