diff --git a/src/gsm/gsm0411_smr.c b/src/gsm/gsm0411_smr.c
index b243c86..a7e9d24 100644
--- a/src/gsm/gsm0411_smr.c
+++ b/src/gsm/gsm0411_smr.c
@@ -94,7 +94,7 @@
 	osmo_timer_del(&inst->rp_timer);
 }
 
-const char *smr_state_names[] = {
+static const char *smr_state_names[] = {
 	"IDLE",
 	"WAIT_FOR_RP_ACK",
 	"illegal state 2"