Index: head/sys/net/iflib.c
===================================================================
--- head/sys/net/iflib.c
+++ head/sys/net/iflib.c
@@ -2450,7 +2450,7 @@
 
 	/* should I merge this back in now that the two paths are basically duplicated? */
 	if (ri->iri_nfrags == 1 &&
-	    ri->iri_frags[0].irf_len <= IFLIB_RX_COPY_THRESH) {
+	    ri->iri_frags[0].irf_len <= MIN(IFLIB_RX_COPY_THRESH, MHLEN)) {
 		rxd_frag_to_sd(rxq, &ri->iri_frags[0], FALSE, &sd);
 		m = *sd.ifsd_m;
 		*sd.ifsd_m = NULL;