diff --git a/lib/include/maca.h b/lib/include/maca.h
index 65ee3605d..1540f682e 100644
--- a/lib/include/maca.h
+++ b/lib/include/maca.h
@@ -5,6 +5,8 @@
 #include <types.h>
 #include <utils.h>
 
+#define MAX_PACKET_SIZE (MAX_PAYLOAD_SIZE + 2) /* packet includes 2 bytes of checksum */
+
 #define MACA_BASE       (0x80004000)
 #define MACA_RESET      ((volatile uint32_t *) (MACA_BASE+0x04))
 #define MACA_RANDOM     ((volatile uint32_t *) (MACA_BASE+0x08))
diff --git a/lib/maca.c b/lib/maca.c
index 918d717c3..f48c7bee3 100644
--- a/lib/maca.c
+++ b/lib/maca.c
@@ -24,8 +24,6 @@
 #define RECV_SOFTIMEOUT (32*128*CLK_PER_BYTE) 
 #endif
 
-#define MAX_PACKET_SIZE (MAX_PAYLOAD_SIZE + 2) /* packet includes 2 bytes of checksum */
-
 #define reg(x) (*(volatile uint32_t *)(x))
 
 static volatile packet_t packet_pool[NUM_PACKETS];