diff --git a/proto/collections/collections.proto b/proto/collections/collections.proto
index 300995eebf1de3f0f533b176e94f037eb8b5beb8..4c17d0d95fc7d2174d6a7351f31532eb4065c051 100644
--- a/proto/collections/collections.proto
+++ b/proto/collections/collections.proto
@@ -26,7 +26,7 @@ message Collection {
   optional bool no_data = 12;
   string schema = 7;
   bool hidden = 13;
-  google.protobuf.Duration TTL = 14;
+  google.protobuf.Duration ttl = 14;
 
   message View {
     string space_id = 1;