diff --git a/src/input/dahdi.c b/src/input/dahdi.c
index 0945daa..911f862 100644
--- a/src/input/dahdi.c
+++ b/src/input/dahdi.c
@@ -252,8 +252,7 @@ static int handle_ts1_write(struct osmo_fd *bfd)
 			sign_link->sapi, msg);
 
 	/* set tx delay timer for next event */
-	e1i_ts->sign.tx_timer.cb = timeout_ts1_write;
-	e1i_ts->sign.tx_timer.data = e1i_ts;
+	osmo_timer_setup(&e1i_ts->sign.tx_timer, timeout_ts1_write, e1i_ts);
 	osmo_timer_schedule(&e1i_ts->sign.tx_timer, 0, 50000);
 
 	return 0;
diff --git a/src/input/ipaccess.c b/src/input/ipaccess.c
index ac84ffc..63ee167 100644
--- a/src/input/ipaccess.c
+++ b/src/input/ipaccess.c
@@ -354,8 +354,7 @@ static int __handle_ts1_write(struct osmo_fd *bfd, struct e1inp_line *line)
 	}
 
 	/* set tx delay timer for next event */
-	e1i_ts->sign.tx_timer.cb = timeout_ts1_write;
-	e1i_ts->sign.tx_timer.data = e1i_ts;
+	osmo_timer_setup(&e1i_ts->sign.tx_timer, timeout_ts1_write, e1i_ts);
 
 	/* Reducing this might break the nanoBTS 900 init. */
 	osmo_timer_schedule(&e1i_ts->sign.tx_timer, 0, e1i_ts->sign.delay);
diff --git a/src/input/misdn.c b/src/input/misdn.c
index 98a836f..347b7bf 100644
--- a/src/input/misdn.c
+++ b/src/input/misdn.c
@@ -283,8 +283,7 @@ static int handle_ts1_write(struct osmo_fd *bfd)
 
 
 	/* set tx delay timer for next event */
-	e1i_ts->sign.tx_timer.cb = timeout_ts1_write;
-	e1i_ts->sign.tx_timer.data = e1i_ts;
+	osmo_timer_setup(&e1i_ts->sign.tx_timer, timeout_ts1_write, e1i_ts);
 	osmo_timer_schedule(&e1i_ts->sign.tx_timer, 0, e1i_ts->sign.delay);
 
 	return ret;
diff --git a/src/input/unixsocket.c b/src/input/unixsocket.c
index 4f287ae..63bd796 100644
--- a/src/input/unixsocket.c
+++ b/src/input/unixsocket.c
@@ -160,8 +160,7 @@ static int unixsocket_write_cb(struct osmo_fd *bfd)
 	}
 
 	/* set tx delay timer for next event */
-	e1i_ts->sign.tx_timer.cb = timeout_ts1_write;
-	e1i_ts->sign.tx_timer.data = e1i_ts;
+	osmo_timer_setup(&e1i_ts->sign.tx_timer, timeout_ts1_write, e1i_ts);
 
 	osmo_timer_schedule(&e1i_ts->sign.tx_timer, 0, e1i_ts->sign.delay);