Index: head/sys/dev/sfxge/sfxge_ev.c
===================================================================
--- head/sys/dev/sfxge/sfxge_ev.c
+++ head/sys/dev/sfxge/sfxge_ev.c
@@ -453,7 +453,7 @@
 		goto out;
 
 	now = ticks;
-	if (now - sc->ev_stats_update_time < hz)
+	if ((unsigned int)(now - sc->ev_stats_update_time) < (unsigned int)hz)
 		goto out;
 
 	sc->ev_stats_update_time = now;
Index: head/sys/dev/sfxge/sfxge_port.c
===================================================================
--- head/sys/dev/sfxge/sfxge_port.c
+++ head/sys/dev/sfxge/sfxge_port.c
@@ -62,7 +62,7 @@
 	}
 
 	now = ticks;
-	if (now - port->mac_stats.update_time < hz) {
+	if ((unsigned int)(now - port->mac_stats.update_time) < (unsigned int)hz) {
 		rc = 0;
 		goto out;
 	}
@@ -570,7 +570,7 @@
 	}
 
 	now = ticks;
-	if (now - port->phy_stats.update_time < hz) {
+	if ((unsigned int)(now - port->phy_stats.update_time) < (unsigned int)hz) {
 		rc = 0;
 		goto out;
 	}