diff --git a/src/common/ebml.cpp b/src/common/ebml.cpp
index 197d46806..b67007f50 100644
--- a/src/common/ebml.cpp
+++ b/src/common/ebml.cpp
@@ -816,8 +816,7 @@ render_should_write_arg(bool with_default) {
 
 bool
 has_default_value(libebml::EbmlElement const &elt) {
-  return elt.DefaultISset();
-  // return elt.ElementSpec().HasDefault();
+  return elt.ElementSpec().HasDefault();
 }
 
 #else