diff --git a/openbsc/src/input/ipaccess.c b/openbsc/src/input/ipaccess.c
index 71a3bde..de5149c 100644
--- a/openbsc/src/input/ipaccess.c
+++ b/openbsc/src/input/ipaccess.c
@@ -44,6 +44,9 @@
 #include <openbsc/ipaccess.h>
 #include <osmocore/talloc.h>
 
+#define PRIV_OML 1
+#define PRIV_RSL 2
+
 /* data structure for one E1 interface with A-bis */
 struct ia_e1_handle {
 	struct bsc_fd listen_fd;
@@ -230,17 +233,17 @@
 			return -EIO;
 		}
 		DEBUGP(DINP, "Identified BTS %u/%u/%u\n", site_id, bts_id, trx_id);
-		if (bfd->priv_nr == 1) {
-			bts->oml_link = e1inp_sign_link_create(&line->ts[1-1],
+		if (bfd->priv_nr == PRIV_OML) {
+			bts->oml_link = e1inp_sign_link_create(&line->ts[PRIV_OML - 1],
 						  E1INP_SIGN_OML, bts->c0,
 						  bts->oml_tei, 0);
-		} else if (bfd->priv_nr == 2) {
+		} else if (bfd->priv_nr == PRIV_RSL) {
 			struct e1inp_ts *e1i_ts;
 			struct bsc_fd *newbfd;
 			struct gsm_bts_trx *trx = gsm_bts_trx_num(bts, trx_id);
 			
 			bfd->data = line = bts->oml_link->ts->line;
-			e1i_ts = &line->ts[2+trx_id - 1];
+			e1i_ts = &line->ts[PRIV_RSL + trx_id - 1];
 			newbfd = &e1i_ts->driver.ipaccess.fd;
 			e1inp_ts_config(e1i_ts, line, E1INP_TS_TYPE_SIGN);
 
@@ -256,7 +259,7 @@
 
 			/* get rid of our old temporary bfd */
 			memcpy(newbfd, bfd, sizeof(*newbfd));
-			newbfd->priv_nr = 2+trx_id;
+			newbfd->priv_nr = PRIV_RSL + trx_id;
 			bsc_unregister_fd(bfd);
 			bsc_register_fd(newbfd);
 			talloc_free(bfd);
@@ -536,7 +539,7 @@
 	bfd = &e1i_ts->driver.ipaccess.fd;
 	bfd->fd = ret;
 	bfd->data = line;
-	bfd->priv_nr = 1;
+	bfd->priv_nr = PRIV_OML;
 	bfd->cb = ipaccess_fd_cb;
 	bfd->when = BSC_FD_READ;
 	ret = bsc_register_fd(bfd);
@@ -578,7 +581,7 @@
 		return bfd->fd;
 	}
 	LOGP(DINP, LOGL_NOTICE, "accept()ed new RSL link from %s\n", inet_ntoa(sa.sin_addr));
-	bfd->priv_nr = 2;
+	bfd->priv_nr = PRIV_RSL;
 	bfd->cb = ipaccess_fd_cb;
 	bfd->when = BSC_FD_READ;
 	ret = bsc_register_fd(bfd);
@@ -652,7 +655,7 @@
 	bfd->cb = ipaccess_fd_cb;
 	bfd->when = BSC_FD_READ | BSC_FD_WRITE;
 	bfd->data = line;
-	bfd->priv_nr = 1;
+	bfd->priv_nr = PRIV_OML;
 
 	if (bfd->fd < 0) {
 		LOGP(DINP, LOGL_ERROR, "could not create TCP socket.\n");