diff --git a/arch/arm/src/stm32h7/stm32_ethernet.c b/arch/arm/src/stm32h7/stm32_ethernet.c
index 490094c60a..529822fb7d 100644
--- a/arch/arm/src/stm32h7/stm32_ethernet.c
+++ b/arch/arm/src/stm32h7/stm32_ethernet.c
@@ -259,8 +259,10 @@
 #  define ETH_MACMDIOAR_CR ETH_MACMDIOAR_CR_DIV42
 #elif STM32_HCLK_FREQUENCY >= 100000000 && STM32_HCLK_FREQUENCY < 150000000
 #  define ETH_MACMDIOAR_CR ETH_MACMDIOAR_CR_DIV62
-#elif STM32_HCLK_FREQUENCY >= 150000000 && STM32_HCLK_FREQUENCY <= 216000000
+#elif STM32_HCLK_FREQUENCY >= 150000000 && STM32_HCLK_FREQUENCY <= 250000000
 #  define ETH_MACMDIOAR_CR ETH_MACMDIOAR_CR_DIV102
+#elif STM32_HCLK_FREQUENCY >= 250000000 && STM32_HCLK_FREQUENCY <= 300000000
+#  define ETH_MACMDIOAR_CR ETH_MACMDIOAR_CR_DIV124
 #else
 #  error "STM32_HCLK_FREQUENCY not supportable"
 #endif