diff --git a/sys/pci/if_rl.c b/sys/pci/if_rl.c
index 98e3352c0298..4f91d1fa664a 100644
--- a/sys/pci/if_rl.c
+++ b/sys/pci/if_rl.c
@@ -148,6 +148,8 @@ static const struct rl_type rl_devs[] = {
 		"Delta Electronics 8139 10/100BaseTX" },
 	{ ADDTRON_VENDORID, ADDTRON_DEVICEID_8139, RL_8139,
 		"Addtron Technology 8139 10/100BaseTX" },
+	{ DLINK_VENDORID, DLINK_DEVICEID_520TX_REVC1, RL_8139,
+		"D-Link DFE-520TX (rev. C1) 10/100BaseTX" },
 	{ DLINK_VENDORID, DLINK_DEVICEID_530TXPLUS, RL_8139,
 		"D-Link DFE-530TX+ 10/100BaseTX" },
 	{ DLINK_VENDORID, DLINK_DEVICEID_690TXD, RL_8139,
diff --git a/sys/pci/if_rlreg.h b/sys/pci/if_rlreg.h
index 7822ce3654bd..be89c4f5896e 100644
--- a/sys/pci/if_rlreg.h
+++ b/sys/pci/if_rlreg.h
@@ -1047,6 +1047,11 @@ struct rl_softc {
  */
 #define	DLINK_DEVICEID_530TXPLUS		0x1300
 
+/*
+ * D-Link DFE-520TX rev. C1 device ID
+ */
+#define	DLINK_DEVICEID_520TX_REVC1		0x4200
+
 /*
  * D-Link DFE-5280T device ID
  */