diff --git a/src/gsm/gsm0411_smc.c b/src/gsm/gsm0411_smc.c
index 187d6e6..2146c9e 100644
--- a/src/gsm/gsm0411_smc.c
+++ b/src/gsm/gsm0411_smc.c
@@ -73,7 +73,7 @@
 	memset(inst, 0, sizeof(*inst));
 	inst->network = network;
 	inst->cp_max_retr = MAX_SMS_RETRY;
-	inst->cp_tc1 = GSM411_TMR_TC1A / (inst->cp_max_retr + 1);
+	inst->cp_tc1 = GSM411_TMR_TC1A_SEC / (inst->cp_max_retr + 1);
 	inst->cp_state = GSM411_CPS_IDLE;
 	inst->mn_recv = mn_recv;
 	inst->mm_send = mm_send;