.write_iosf_sb_reg      = ixgbe_write_iosf_sb_reg_x550,
 };
 
-static struct ixgbe_mac_operations mac_ops_x550em_a = {
+static const struct ixgbe_mac_operations mac_ops_x550em_a = {
        X550_COMMON_MAC
        .led_on                 = ixgbe_led_on_t_x550em,
        .led_off                = ixgbe_led_off_t_x550em,
        .write_iosf_sb_reg      = ixgbe_write_iosf_sb_reg_x550a,
 };
 
-static struct ixgbe_mac_operations mac_ops_x550em_a_fw = {
+static const struct ixgbe_mac_operations mac_ops_x550em_a_fw = {
        X550_COMMON_MAC
        .led_on                 = ixgbe_led_on_generic,
        .led_off                = ixgbe_led_off_generic,