diff --git a/sys/dev/vt/vt_buf.c b/sys/dev/vt/vt_buf.c
index 0b078ec..dd729a4 100644
--- a/sys/dev/vt/vt_buf.c
+++ b/sys/dev/vt/vt_buf.c
@@ -231,7 +231,6 @@ static inline void
 vtbuf_dirty(struct vt_buf *vb, const term_rect_t *area)
 {
 
-	VTBUF_LOCK(vb);
 	if (vb->vb_dirtyrect.tr_begin.tp_row > area->tr_begin.tp_row)
 		vb->vb_dirtyrect.tr_begin.tp_row = area->tr_begin.tp_row;
 	if (vb->vb_dirtyrect.tr_begin.tp_col > area->tr_begin.tp_col)
@@ -244,7 +243,6 @@ vtbuf_dirty(struct vt_buf *vb, const term_rect_t *area)
 	    vtbuf_dirty_axis(area->tr_begin.tp_row, area->tr_end.tp_row);
 	vb->vb_dirtymask.vbm_col |=
 	    vtbuf_dirty_axis(area->tr_begin.tp_col, area->tr_end.tp_col);
-	VTBUF_UNLOCK(vb);
 }
 
 static inline void
@@ -271,11 +269,9 @@ void
 vtbuf_undirty(struct vt_buf *vb, term_rect_t *r, struct vt_bufmask *m)
 {
 
-	VTBUF_LOCK(vb);
 	*r = vb->vb_dirtyrect;
 	*m = vb->vb_dirtymask;
 	vtbuf_make_undirty(vb);
-	VTBUF_UNLOCK(vb);
 }
 
 void
@@ -513,9 +509,7 @@ vtbuf_putchar(struct vt_buf *vb, const term_pos_t *p, term_char_t c)
 	row = vb->vb_rows[(vb->vb_curroffset + p->tp_row) %
 	    VTBUF_MAX_HEIGHT(vb)];
 	if (row[p->tp_col] != c) {
-		VTBUF_LOCK(vb);
 		row[p->tp_col] = c;
-		VTBUF_UNLOCK(vb);
 		vtbuf_dirty_cell(vb, p);
 	}
 }