diff --git a/src/ifcwrap/IfcParseWrapper.i b/src/ifcwrap/IfcParseWrapper.i
index 472cbc8c1e..96aafd6237 100644
--- a/src/ifcwrap/IfcParseWrapper.i
+++ b/src/ifcwrap/IfcParseWrapper.i
@@ -90,7 +90,9 @@ private:
 %extend IfcUtil::IfcBaseClass {
 
 	int get_attribute_category(const std::string& name) const {
-		if (IfcSchema::Type::IsSimple($self->type())) return -1;
+		if (IfcSchema::Type::IsSimple($self->type())) {
+			return name == "wrappedValue";
+		}
 		IfcUtil::IfcBaseEntity* self_ = (IfcUtil::IfcBaseEntity*) self; 
 		const std::vector<std::string> names = self_->getAttributeNames();
 		if (std::find(names.begin(), names.end(), name) != names.end()) {
diff --git a/test/tests.py b/test/tests.py
index 256ed3b8b9..a755df6f9f 100644
--- a/test/tests.py
+++ b/test/tests.py
@@ -41,6 +41,8 @@ assert f[16] in f.get_inverse(f[15])
 assert f[16].UnitComponent is not None
 f.remove(f[15])
 assert f[16].UnitComponent is None
+prop = f.by_type("IfcPropertySingleValue")[0]
+assert prop.NominalValue.wrappedValuex in str(prop)
 
 # Some operations on ifcopenshell.entity_instance
 assert f[22].Id == ''