diff --git a/openbsc/include/openbsc/gsm_04_08.h b/openbsc/include/openbsc/gsm_04_08.h
index 1e5ffce..55f8776 100644
--- a/openbsc/include/openbsc/gsm_04_08.h
+++ b/openbsc/include/openbsc/gsm_04_08.h
@@ -60,5 +60,6 @@
 int gsm48_rx_rr_modif_ack(struct msgb *msg);
 int gsm48_parse_meas_rep(struct gsm_meas_rep *rep, struct msgb *msg);
 
+struct msgb *gsm48_create_mm_serv_rej(enum gsm48_reject_value value);
 
 #endif
diff --git a/openbsc/src/gsm_04_08.c b/openbsc/src/gsm_04_08.c
index e3eafe6..21bdfc5 100644
--- a/openbsc/src/gsm_04_08.c
+++ b/openbsc/src/gsm_04_08.c
@@ -709,19 +709,17 @@
 static int gsm48_tx_mm_serv_rej(struct gsm_subscriber_connection *conn,
 				enum gsm48_reject_value value)
 {
-	struct msgb *msg = gsm48_msgb_alloc();
-	struct gsm48_hdr *gh;
+	struct msgb *msg;
 
-	gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1);
+	msg = gsm48_create_mm_serv_rej(value);
+	if (!msg) {
+		LOGP(DMM, LOGL_ERROR, "Failed to allocate CM Service Reject.\n");
+		return -1;
+	}
 
+	DEBUGP(DMM, "-> CM SERVICE Reject cause: %d\n", value);
 	msg->lchan = conn->lchan;
 	use_subscr_con(conn);
-
-	gh->proto_discr = GSM48_PDISC_MM;
-	gh->msg_type = GSM48_MT_MM_CM_SERV_REJ;
-	gh->data[0] = value;
-	DEBUGP(DMM, "-> CM SERVICE Reject cause: %d\n", value);
-
 	return gsm48_conn_sendmsg(msg, conn, NULL);
 }
 
diff --git a/openbsc/src/gsm_04_08_utils.c b/openbsc/src/gsm_04_08_utils.c
index 5a8ded7..eb8c034 100644
--- a/openbsc/src/gsm_04_08_utils.c
+++ b/openbsc/src/gsm_04_08_utils.c
@@ -564,3 +564,20 @@
 
 	return 0;
 }
+
+struct msgb *gsm48_create_mm_serv_rej(enum gsm48_reject_value value)
+{
+	struct msgb *msg;
+	struct gsm48_hdr *gh;
+
+	msg = gsm48_msgb_alloc();
+	if (!msg)
+		return NULL;
+
+	gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1);
+	gh->proto_discr = GSM48_PDISC_MM;
+	gh->msg_type = GSM48_MT_MM_CM_SERV_REJ;
+	gh->data[0] = value;
+
+	return msg;
+}