diff --git a/include/libopencm3/ethernet/mac_stm32fxx7.h b/include/libopencm3/ethernet/mac_stm32fxx7.h
index a14a9111..2d7546af 100644
--- a/include/libopencm3/ethernet/mac_stm32fxx7.h
+++ b/include/libopencm3/ethernet/mac_stm32fxx7.h
@@ -719,7 +719,7 @@ void eth_desc_init(uint8_t *buf, uint32_t nTx, uint32_t nRx, uint32_t cTx,
 bool eth_tx(uint8_t *ppkt, uint32_t n);
 bool eth_rx(uint8_t *ppkt, uint32_t *len, uint32_t maxlen);
 
-void eth_init(enum eth_clk clock);
+void eth_init(uint8_t phy,enum eth_clk clock);
 void eth_start(void);
 
 void eth_enable_checksum_offload(void);
@@ -737,8 +737,8 @@ END_DECLS
  *  rcc_periph_reset_pulse(RCC_ETHMAC);
  *  [ init gpio pins ]
  *  rcc_periph_reset_pulse(RCC_ETHMAC);
- *  phy_init();
- *  eth_init();
+ *  phy_init(0);
+ *  eth_init(0, ETH_CLK_025_035MHZ);
  *  eth_set_mac(mac);
  *  eth_desc_init(buffer, &eth_buffer[0], ETH_TXBUFNB, ETH_RXBUFNB,
  *                  ETH_TX_BUF_SIZE, ETH_RX_BUF_SIZE, false);
diff --git a/lib/ethernet/mac_stm32fxx7.c b/lib/ethernet/mac_stm32fxx7.c
index 16f76a84..2ed1b00e 100644
--- a/lib/ethernet/mac_stm32fxx7.c
+++ b/lib/ethernet/mac_stm32fxx7.c
@@ -200,10 +200,10 @@ void eth_start(void)
  *
  * @param[in] clock enum eth_clk Core clock speed
  */
-void eth_init(enum eth_clk clock)
+void eth_init(uint8_t phy, enum eth_clk clock)
 {
 	ETH_MACMIIAR = clock;
-	phy_reset();
+	phy_reset(phy);
 
 	ETH_MACCR = ETH_MACCR_CSTF | ETH_MACCR_FES | ETH_MACCR_DM |
 		ETH_MACCR_APCS | ETH_MACCR_RD;