diff --git a/sys/pci/if_pcn.c b/sys/pci/if_pcn.c
index 5f6625b433b7..0767dffc916f 100644
--- a/sys/pci/if_pcn.c
+++ b/sys/pci/if_pcn.c
@@ -238,13 +238,16 @@ static int pcn_miibus_readreg(dev, phy, reg)
 
 	sc = device_get_softc(dev);
 
-	if (phy >= 30)
+	if (sc->pcn_phyaddr && phy > sc->pcn_phyaddr)
 		return(0);
 
 	pcn_bcr_write(sc, PCN_BCR_MIIADDR, reg | (phy << 5));
 	val = pcn_bcr_read(sc, PCN_BCR_MIIDATA) & 0xFFFF;
 	if (val == 0xFFFF)
 		return(0);
+
+	sc->pcn_phyaddr = phy;
+
 	return(val);
 }
 
diff --git a/sys/pci/if_pcnreg.h b/sys/pci/if_pcnreg.h
index 70740352e963..dc234b62895f 100644
--- a/sys/pci/if_pcnreg.h
+++ b/sys/pci/if_pcnreg.h
@@ -453,6 +453,7 @@ struct pcn_softc {
 	device_t		pcn_miibus;
 	u_int8_t		pcn_unit;
 	u_int8_t		pcn_link;
+	u_int8_t		pcn_phyaddr;
 	int			pcn_if_flags;
 	int			pcn_type;
 	struct pcn_list_data	*pcn_ldata;