diff --git a/drivers/isdn/hardware/avm/c4.c b/drivers/isdn/hardware/avm/c4.c
index 6f5efa8d..d58f927 100644
--- a/drivers/isdn/hardware/avm/c4.c
+++ b/drivers/isdn/hardware/avm/c4.c
@@ -457,7 +457,8 @@
 		printk(KERN_DEBUG "%s: tx put 0x%x len=%d\n",
 				card->name, skb->data[2], txlen);
 #endif
-		memcpy(dma->sendbuf.dmabuf, skb->data+2, skb->len-2);
+		skb_copy_from_linear_data_offset(skb, 2, dma->sendbuf.dmabuf,
+						 skb->len - 2);
 	}
 	txlen = (txlen + 3) & ~3;