diff --git a/src/ifcparse/IfcHierarchyHelper.h b/src/ifcparse/IfcHierarchyHelper.h
index 6bdc171ca9..8bb962d5b0 100644
--- a/src/ifcparse/IfcHierarchyHelper.h
+++ b/src/ifcparse/IfcHierarchyHelper.h
@@ -453,7 +453,7 @@ class IFC_PARSE_API IfcHierarchyHelper : public IfcParse::IfcFile {
             }
             int relating_index = 4;
             int related_index = 5;
-            if (T::Class().name() == "IfcRelContainedInSpatialStructure" || std::is_base_of<Schema::IfcRelDefines, T>::value) {
+            if (T::Class().name() == "IfcRelContainedInSpatialStructure" || std::is_base_of<typename Schema::IfcRelDefines, T>::value) {
                 // some classes have attributes reversed.
                 std::swap(relating_index, related_index);
             }