diff --git a/src/rate_ctr.c b/src/rate_ctr.c
index a7fc949..a0e1814 100644
--- a/src/rate_ctr.c
+++ b/src/rate_ctr.c
@@ -142,10 +142,10 @@
 	return NULL;
 }
 
-struct rate_ctr *rate_ctr_get_by_name(const struct rate_ctr_group *ctrg, const char *name)
+const struct rate_ctr *rate_ctr_get_by_name(const struct rate_ctr_group *ctrg, const char *name)
 {
 	int i;
-	struct rate_ctr_desc *ctr_desc;
+	const struct rate_ctr_desc *ctr_desc;
 
 	if (!ctrg->desc)
 		return NULL;