diff --git a/arch/arm/src/lpc17xx/lpc17_emacram.h b/arch/arm/src/lpc17xx/lpc17_emacram.h
index 0a47636e20c..158e83d9709 100644
--- a/arch/arm/src/lpc17xx/lpc17_emacram.h
+++ b/arch/arm/src/lpc17xx/lpc17_emacram.h
@@ -137,10 +137,16 @@
  * 15,756 is not well aligned.).
  */
 
+#define LPC17_TXDESC_SIZE     8
+#define LPC17_TXSTAT_SIZE     4
+
 #define LPC17_TXDESCTAB_SIZE (CONFIG_NET_NTXDESC*LPC17_TXDESC_SIZE)
 #define LPC17_TXSTATTAB_SIZE (CONFIG_NET_NTXDESC*LPC17_TXSTAT_SIZE)
 #define LPC17_TXTAB_SIZE     (LPC17_TXDESCTAB_SIZE+LPC17_TXSTATTAB_SIZE)
 
+#define LPC17_RXDESC_SIZE     8
+#defube LPC17_RXSTAT_SIZE     8
+
 #define LPC17_RXDESCTAB_SIZE (CONFIG_NET_NRXDESC*LPC17_RXDESC_SIZE)
 #define LPC17_RXSTATTAB_SIZE (CONFIG_NET_NRXDESC*LPC17_RXSTAT_SIZE)
 #define LPC17_RXTAB_SIZE     (LPC17_RXDESCTAB_SIZE+LPC17_RXSTATTAB_SIZE)