diff --git a/components/drivers/spi/enc28j60.h b/components/drivers/spi/enc28j60.h
index 471b71e..757609e 100644
--- a/components/drivers/spi/enc28j60.h
+++ b/components/drivers/spi/enc28j60.h
@@ -306,10 +306,10 @@
 // start with recbuf at 0/
 #define RXSTART_INIT    0x0
 // receive buffer end
-#define RXSTOP_INIT     (0x1FFF - MAX_TX_PACKAGE_SIZE*2) - 1
+#define RXSTOP_INIT     ((0x1FFF - MAX_TX_PACKAGE_SIZE * 2) - 1)
 // start TX buffer at 0x1FFF-0x0600, pace for one full ethernet frame (~1500 bytes)
 
-#define TXSTART_INIT    (0x1FFF - MAX_TX_PACKAGE_SIZE*2)
+#define TXSTART_INIT    (0x1FFF - MAX_TX_PACKAGE_SIZE * 2)
 // stp TX buffer at end of mem
 #define TXSTOP_INIT     0x1FFF