diff --git a/src/ifcparse/IfcParse.cpp b/src/ifcparse/IfcParse.cpp
index 26c07f06ed..48574b8049 100644
--- a/src/ifcparse/IfcParse.cpp
+++ b/src/ifcparse/IfcParse.cpp
@@ -1147,7 +1147,10 @@ std::string IfcEntityInstanceData::toString(bool upper) const {
             ss << ",";
         }
         if (attributes_[i] == 0) {
-            ss << "$";
+            if (type_->as_entity()->derived()[i])
+               ss << "*";
+            else
+               ss << "$";
         } else {
             ss << attributes_[i]->toString(upper);
         }