diff --git a/drivers/net/fm/t4240.c b/drivers/net/fm/t4240.c
index ae5aca4..70887fa 100644
--- a/drivers/net/fm/t4240.c
+++ b/drivers/net/fm/t4240.c
@@ -74,7 +74,7 @@
 	if ((port == FM1_DTSEC9 || port == FM1_DTSEC10) &&
 	    ((is_serdes_configured(XFI_FM1_MAC9)) ||
 	     (is_serdes_configured(XFI_FM1_MAC10))))
-		return PHY_INTERFACE_MODE_XGMII;
+		return PHY_INTERFACE_MODE_NONE;
 
 	if ((port == FM2_10GEC1 || port == FM2_10GEC2) &&
 	    ((is_serdes_configured(XAUI_FM2_MAC9))	||