diff --git a/os/ex/devices/ST/lis302dl.c b/os/ex/devices/ST/lis302dl.c
index 099698d66..4ee84b4d7 100644
--- a/os/ex/devices/ST/lis302dl.c
+++ b/os/ex/devices/ST/lis302dl.c
@@ -332,7 +332,7 @@ static msg_t acc_reset_sensivity(void *ip) {
 static msg_t acc_set_full_scale(LIS302DLDriver *devp, lis302dl_acc_fs_t fs) {
   float newfs, scale;
   uint8_t i, cr;
-  msg_t msg;
+  msg_t msg = MSG_OK;
 
   osalDbgCheck(devp != NULL);