diff --git a/sys/pci/if_xl.c b/sys/pci/if_xl.c
index 20921e9ac560..2487b33a0145 100644
--- a/sys/pci/if_xl.c
+++ b/sys/pci/if_xl.c
@@ -1271,6 +1271,8 @@ xl_attach(dev)
 		    XL_FLAG_INVERT_LED_PWR | XL_FLAG_INVERT_MII_PWR;
 	if (pci_get_device(dev) == TC_DEVICEID_HURRICANE_556)
 		sc->xl_flags |= XL_FLAG_8BITROM;
+	if (pci_get_device(dev) == TC_DEVICEID_HURRICANE_556B)
+		sc->xl_flags |= XL_FLAG_NO_XCVR_PWR;
 
 	if (pci_get_device(dev) == TC_DEVICEID_HURRICANE_575A ||
 	    pci_get_device(dev) == TC_DEVICEID_HURRICANE_575B ||
@@ -1623,6 +1625,11 @@ xl_attach(dev)
 
 done:
 
+	if (sc->xl_flags & XL_FLAG_NO_XCVR_PWR) {
+		XL_SEL_WIN(0);
+		CSR_WRITE_2(sc, XL_W0_MFG_ID, XL_NO_XCVR_PWR_MAGICBITS);
+	}
+
 	/*
 	 * Call MI attach routine.
 	 */
diff --git a/sys/pci/if_xlreg.h b/sys/pci/if_xlreg.h
index d2557529e667..f373f0276791 100644
--- a/sys/pci/if_xlreg.h
+++ b/sys/pci/if_xlreg.h
@@ -560,6 +560,9 @@ struct xl_mii_frame {
 #define XL_FLAG_8BITROM			0x0010
 #define XL_FLAG_INVERT_LED_PWR		0x0020
 #define XL_FLAG_INVERT_MII_PWR		0x0040
+#define XL_FLAG_NO_XCVR_PWR		0x0080
+
+#define XL_NO_XCVR_PWR_MAGICBITS	0x0900
 
 struct xl_softc {
 	struct arpcom		arpcom;		/* interface info */