diff --git a/configs/nucleus2g/include/board.h b/configs/nucleus2g/include/board.h
index 058b50319cf..74965c77831 100755
--- a/configs/nucleus2g/include/board.h
+++ b/configs/nucleus2g/include/board.h
@@ -49,6 +49,9 @@
 
 /* Clocking *************************************************************************/
 
+#define LPC17_CCLK                 80000000 /* 80Mhz*/
+
+
 /* LED definitions ******************************************************************/
 
 #define LED_STARTED                0