diff --git a/sys/src/cmd/nusb/ether/lan78xx.c b/sys/src/cmd/nusb/ether/lan78xx.c
index 38e77e4a4..3f7c1d190 100644
--- a/sys/src/cmd/nusb/ether/lan78xx.c
+++ b/sys/src/cmd/nusb/ether/lan78xx.c
@@ -252,11 +252,10 @@ lan78xxreceive(Dev *ep)
 			break;
 		if((hd & Rxerror) == 0){
 			if(n == BLEN(b)){
-				b->wp -= 4;
 				etheriq(b);
 				return 0;
 			}
-			etheriq(copyblock(b, n - 4));
+			etheriq(copyblock(b, n));
 		}
 		b->rp = (uchar*)(((uintptr)b->rp + n + 3)&~3);
 	}