diff --git a/include/osmocom/core/rate_ctr.h b/include/osmocom/core/rate_ctr.h
index 03b1bfb..4fecdfa 100644
--- a/include/osmocom/core/rate_ctr.h
+++ b/include/osmocom/core/rate_ctr.h
@@ -71,6 +71,11 @@
 					    const struct rate_ctr_group_desc *desc,
 					    unsigned int idx);
 
+static inline void rate_ctr_group_upd_idx(struct rate_ctr_group *grp, unsigned int idx)
+{
+	grp->idx = idx;
+}
+
 void rate_ctr_group_free(struct rate_ctr_group *grp);
 
 void rate_ctr_add(struct rate_ctr *ctr, int inc);
diff --git a/include/osmocom/core/stat_item.h b/include/osmocom/core/stat_item.h
index c2ad8cf..c1466f8 100644
--- a/include/osmocom/core/stat_item.h
+++ b/include/osmocom/core/stat_item.h
@@ -70,6 +70,12 @@
 	const struct osmo_stat_item_group_desc *desc,
 	unsigned int idx);
 
+static inline void osmo_stat_item_group_udp_idx(
+	struct osmo_stat_item_group *grp, unsigned int idx)
+{
+	grp->idx = idx;
+}
+
 void osmo_stat_item_group_free(struct osmo_stat_item_group *statg);
 
 void osmo_stat_item_set(struct osmo_stat_item *item, int32_t value);