diff --git a/sw/airborne/boards/ardrone/navdata.c b/sw/airborne/boards/ardrone/navdata.c
index 8c6425bb26..5b2d6bb7c2 100644
--- a/sw/airborne/boards/ardrone/navdata.c
+++ b/sw/airborne/boards/ardrone/navdata.c
@@ -36,6 +36,10 @@
 #include <math.h>
 #include "navdata.h"
 
+#define NAVDATA_PACKET_SIZE 60
+#define NAVDATA_BUFFER_SIZE 80
+#define NAVDATA_START_BYTE 0x3a
+
 typedef struct {
 	uint8_t isInitialized;
 	uint8_t isOpen;
diff --git a/sw/airborne/boards/ardrone/navdata.h b/sw/airborne/boards/ardrone/navdata.h
index 758f30a151..bd29297d81 100644
--- a/sw/airborne/boards/ardrone/navdata.h
+++ b/sw/airborne/boards/ardrone/navdata.h
@@ -32,10 +32,6 @@
 
 #include <stdint.h>
 
-#define NAVDATA_PACKET_SIZE 60
-#define NAVDATA_BUFFER_SIZE 80
-#define NAVDATA_START_BYTE 0x3a
-
 typedef struct
 {
   uint16_t taille;