diff --git a/src/input/ipaccess.c b/src/input/ipaccess.c
index 4684520..07b47b2 100644
--- a/src/input/ipaccess.c
+++ b/src/input/ipaccess.c
@@ -61,15 +61,15 @@
  *      - ID_REQUEST: first messages once OML has been established.
  *      - ID_ACK: in reply to ID_ACK.
  */
-const uint8_t ipa_pong_msg[] = {
+static const uint8_t ipa_pong_msg[] = {
 	0, 1, IPAC_PROTO_IPACCESS, IPAC_MSGT_PONG
 };
 
-const uint8_t ipa_id_ack_msg[] = {
+static const uint8_t ipa_id_ack_msg[] = {
 	0, 1, IPAC_PROTO_IPACCESS, IPAC_MSGT_ID_ACK
 };
 
-const uint8_t ipa_id_req_msg[] = {
+static const uint8_t ipa_id_req_msg[] = {
 	0, 17, IPAC_PROTO_IPACCESS, IPAC_MSGT_ID_GET,
 	0x01, IPAC_IDTAG_UNIT,
 	0x01, IPAC_IDTAG_MACADDR,