diff --git a/backend/webappdb/webappdb.go b/backend/webappdb/webappdb.go
index 67784dee35fbe50b3aa45bf7400859adbe64757d..5166982a170f54909a4605ba1b052efe3c1e0491 100644
--- a/backend/webappdb/webappdb.go
+++ b/backend/webappdb/webappdb.go
@@ -11,6 +11,9 @@ import (
 	auxpb "git.autistici.org/ai3/tools/aux-db/proto"
 )
 
+// Data type of the webapp-related resources in aux-db.
+const auxDbWebappDataType = "cms_info"
+
 // AuxWebappBackend looks up website information (cms_info data type) in
 // the aux-db service.
 type AuxWebappBackend struct {
@@ -112,7 +115,7 @@ func (tx *wdbTX) lookup(ctx context.Context, resources []*as.Resource) {
 	for _, r := range resources {
 		// Create the lookup key for aux-db.
 		auxKey := auxpb.Key{
-			Type:       "webapp",
+			Type:       auxDbWebappDataType,
 			Shard:      r.Shard,
 			ResourceID: r.ID.String(),
 		}