diff --git a/drivers/net/sfc/ethtool.c b/drivers/net/sfc/ethtool.c
index 0e81af6..aad0d1b 100644
--- a/drivers/net/sfc/ethtool.c
+++ b/drivers/net/sfc/ethtool.c
@@ -219,6 +219,9 @@
 	struct efx_nic *efx = netdev_priv(net_dev);
 	int rc;
 
+	if (EFX_WORKAROUND_13963(efx) && !ecmd->autoneg)
+		return -EINVAL;
+
 	/* Falcon GMAC does not support 1000Mbps HD */
 	if (ecmd->speed == SPEED_1000 && ecmd->duplex != DUPLEX_FULL) {
 		EFX_LOG(efx, "rejecting unsupported 1000Mbps HD"