diff --git a/drivers/isdn/hardware/mISDN/netjet.c b/drivers/isdn/hardware/mISDN/netjet.c
index 6dea4c180c49..feada9d7cbcc 100644
--- a/drivers/isdn/hardware/mISDN/netjet.c
+++ b/drivers/isdn/hardware/mISDN/netjet.c
@@ -963,8 +963,8 @@ nj_release(struct tiger_hw *card)
 		nj_disable_hwirq(card);
 		mode_tiger(&card->bc[0], ISDN_P_NONE);
 		mode_tiger(&card->bc[1], ISDN_P_NONE);
-		card->isac.release(&card->isac);
 		spin_unlock_irqrestore(&card->lock, flags);
+		card->isac.release(&card->isac);
 		release_region(card->base, card->base_s);
 		card->base_s = 0;
 	}