diff --git a/gtk/gtkwidgetpath.c b/gtk/gtkwidgetpath.c
index a694f7b07d..5720b38444 100644
--- a/gtk/gtkwidgetpath.c
+++ b/gtk/gtkwidgetpath.c
@@ -331,7 +331,7 @@ gtk_widget_path_to_string (const GtkWidgetPath *path)
 
       if (elem->siblings)
         g_string_append_printf (string, "[%d/%d]",
-                                elem->sibling_index,
+                                elem->sibling_index + 1,
                                 gtk_widget_path_length (elem->siblings));
 
       if (elem->classes)