diff --git a/repertory/librepertory/src/providers/s3/s3_provider.cpp b/repertory/librepertory/src/providers/s3/s3_provider.cpp
index 7173f70c..747f7095 100644
--- a/repertory/librepertory/src/providers/s3/s3_provider.cpp
+++ b/repertory/librepertory/src/providers/s3/s3_provider.cpp
@@ -44,7 +44,7 @@ namespace {
                                     const std::string &object_name)
     -> repertory::api_error {
   request.path = object_name;
-  if ((cfg.bucket + request.path).subst(0U).size() > 1024U) {
+  if ((cfg.bucket + request.path).substr(0U).size() > 1024U) {
     return repertory::api_error::name_too_long;
   }