Index: head/sys/dev/sfxge/common/efx_port.c
===================================================================
--- head/sys/dev/sfxge/common/efx_port.c
+++ head/sys/dev/sfxge/common/efx_port.c
@@ -149,7 +149,7 @@
 	EFSYS_ASSERT(link_mode < EFX_LINK_NMODES);
 
 	if (EFX_TEST_QWORD_BIT(encp->enc_loopback_types[link_mode],
-		loopback_type) == 0) {
+		(int)loopback_type) == 0) {
 		rc = ENOTSUP;
 		goto fail1;
 	}