diff --git a/addons/chan_mobile.c b/addons/chan_mobile.c
index dd48f933eb05aae7d5ea8a2f59bf54a4f52a0acb..5495c7f2272216888a2d099bd089fa7c329192ad 100644
--- a/addons/chan_mobile.c
+++ b/addons/chan_mobile.c
@@ -1185,7 +1185,7 @@ static int mbl_devicestate(void *data)
 	int res = AST_DEVICE_INVALID;
 	struct mbl_pvt *pvt;
 
-	device = ast_strdupa(S_OR(data, ""));
+	device = ast_strdupa(S_OR((char *) data, ""));
 
 	ast_debug(1, "Checking device state for device %s\n", device);