diff --git a/sys/dev/ice/ice_adminq_cmd.h b/sys/dev/ice/ice_adminq_cmd.h
--- a/sys/dev/ice/ice_adminq_cmd.h
+++ b/sys/dev/ice/ice_adminq_cmd.h
@@ -2131,6 +2131,7 @@
 #define ICE_AQC_PORT_OPT_MAX_LANE_50G	6
 #define ICE_AQC_PORT_OPT_MAX_LANE_100G	7
 #define ICE_AQC_PORT_OPT_MAX_LANE_200G	8
+#define ICE_AQC_PORT_OPT_MAX_LANE_40G	9
 	u8 global_scid[2];
 	u8 phy_scid[2];
 	u8 pf2port_cid[2];
diff --git a/sys/dev/ice/ice_lib.c b/sys/dev/ice/ice_lib.c
--- a/sys/dev/ice/ice_lib.c
+++ b/sys/dev/ice/ice_lib.c
@@ -11344,10 +11344,10 @@
 		return err;
 
 	if (cage_type == 0x11 ||  /* SFP */
-	   cage_type == 0x12) {   /* SFP28 */
+	    cage_type == 0x12) {   /* SFP28 */
 		port_topology->serdes_lane_count = 1;
 	} else if (cage_type == 0x13 ||  /* QSFP */
-		  cage_type == 0x14) {   /* QSFP28 */
+	    cage_type == 0x14) {   /* QSFP28 */
 		u8 max_speed = 0;
 
 		err = ice_get_maxspeed(hw, port_topology->primary_serdes_lane,
@@ -11362,7 +11362,8 @@
 
 		if (max_speed == ICE_AQC_PORT_OPT_MAX_LANE_100G)
 			port_topology->serdes_lane_count = 4;
-		else if (max_speed == ICE_AQC_PORT_OPT_MAX_LANE_50G)
+		else if (max_speed == ICE_AQC_PORT_OPT_MAX_LANE_50G ||
+		    max_speed == ICE_AQC_PORT_OPT_MAX_LANE_40G)
 			port_topology->serdes_lane_count = 2;
 		else
 			port_topology->serdes_lane_count = 1;