diff --git a/src/soc/amd/common/block/include/amdblocks/spi.h b/src/soc/amd/common/block/include/amdblocks/spi.h
index fec099dc6a..d226e0c05d 100644
--- a/src/soc/amd/common/block/include/amdblocks/spi.h
+++ b/src/soc/amd/common/block/include/amdblocks/spi.h
@@ -55,7 +55,8 @@ enum spi100_speed {
 #define   SPI_RD4DW_EN_HOST		BIT(15)
 
 #define SPI_FIFO			0x80
-#define   SPI_FIFO_DEPTH		(0xc7 - SPI_FIFO)
+#define SPI_FIFO_LAST_BYTE		0xc7
+#define SPI_FIFO_DEPTH			(SPI_FIFO_LAST_BYTE - SPI_FIFO)
 
 struct spi_config {
 	/*