diff --git a/src/io.c b/src/io.c
index 6cde801..e3078e1 100644
--- a/src/io.c
+++ b/src/io.c
@@ -31,6 +31,7 @@
  *	@brief Handles device I/O (non-OS specific).
  */
 #include "io.h"
+#include "ir.h"
 
 #include <stdlib.h>                     /* for free, malloc */
 
@@ -90,6 +91,7 @@ void wiiuse_handshake(struct wiimote_t* wm, byte* data, uint16_t len) {
 		{
 			struct read_req_t* req = wm->read_req;
 			struct accel_t* accel = &wm->accel_calib;
+			byte val;
 
 			/* received read data */
 			accel->cal_zero.x = req->buf[0];
@@ -109,7 +111,7 @@ void wiiuse_handshake(struct wiimote_t* wm, byte* data, uint16_t len) {
 					accel->cal_g.x, accel->cal_g.y, accel->cal_g.z);
 
 			/* M+ off */
-			byte val = 0x55;
+			val = 0x55;
 			wiiuse_write_data_cb(wm, WM_EXP_MEM_ENABLE1, &val, 1, wiiuse_disable_motion_plus1);
 
 			break;