diff --git a/ports/stm32/eth_phy.h b/ports/stm32/eth_phy.h
index 5036905c1f..dccfb7951a 100644
--- a/ports/stm32/eth_phy.h
+++ b/ports/stm32/eth_phy.h
@@ -26,7 +26,7 @@
  */
 
 #ifndef MICROPY_INCLUDED_STM32_PHY_H
-#define MICROPY_INCLUDED_STM32_PYH_H
+#define MICROPY_INCLUDED_STM32_PHY_H
 
 #if defined(MICROPY_HW_ETH_MDC)