diff --git a/src/gsm/abis_nm.c b/src/gsm/abis_nm.c
index 49d05ba..e25fdd0 100644
--- a/src/gsm/abis_nm.c
+++ b/src/gsm/abis_nm.c
@@ -928,14 +928,19 @@
 	return GSM_PCHAN_NONE;
 }
 
-const char *abis_nm_dump_foh(const struct abis_om_fom_hdr *foh)
+char *abis_nm_dump_foh_buf(char *buf, size_t buf_len, const struct abis_om_fom_hdr *foh)
 {
-	static char foh_buf[128];
-	snprintf(foh_buf, sizeof(foh_buf), "OC=%s(%02x) INST=(%02x,%02x,%02x)",
+	snprintf(buf, buf_len, "OC=%s(%02x) INST=(%02x,%02x,%02x)",
 		get_value_string(abis_nm_obj_class_names, foh->obj_class),
 		foh->obj_class, foh->obj_inst.bts_nr, foh->obj_inst.trx_nr,
 		foh->obj_inst.ts_nr);
-	return foh_buf;
+	return buf;
+}
+
+const char *abis_nm_dump_foh(const struct abis_om_fom_hdr *foh)
+{
+	static char foh_buf[128];
+	return abis_nm_dump_foh_buf(foh_buf, sizeof(foh_buf), foh);
 }
 
 /* this is just for compatibility reasons, it is now a macro */