diff --git a/arch/arm/src/stm32f7/stm32_ethernet.c b/arch/arm/src/stm32f7/stm32_ethernet.c
index ba4cc109d6..3a81e5f45d 100644
--- a/arch/arm/src/stm32f7/stm32_ethernet.c
+++ b/arch/arm/src/stm32f7/stm32_ethernet.c
@@ -235,8 +235,8 @@
  */
 
 #define DMA_BUFFER_MASK    (ARMV7M_DCACHE_LINESIZE - 1)
-#define DMA_ALIGN_UP(n)    (((n) + DMA_BUFFER_MASK) & ~ARMV7M_DCACHE_LINESIZE)
-#define DMA_ALIGN_DOWBN(n) ((n) & ~ARMV7M_DCACHE_LINESIZE)
+#define DMA_ALIGN_UP(n)    (((n) + DMA_BUFFER_MASK) & ~DMA_BUFFER_MASK)
+#define DMA_ALIGN_DOWN(n)  ((n) & ~DMA_BUFFER_MASK)
 
 #ifdef CONFIG_STM32F7_ETH_ENHANCEDDESC
 #  define RXDESC_SIZE       16