diff --git a/gtksourceview/gtksourcegutter.c b/gtksourceview/gtksourcegutter.c
index a46b12b..eaa9798 100644
--- a/gtksourceview/gtksourcegutter.c
+++ b/gtksourceview/gtksourcegutter.c
@@ -1457,7 +1457,7 @@ redraw_for_window (GtkSourceGutter *gutter,
 	Renderer *at_x = NULL;
 	GList *item;
 	gboolean redraw;
-	gint start;
+	gint start=0;
 
 	if (event->window != get_window (gutter) && act_on_window)
 	{
