diff --git a/src/property.h b/src/property.h
index 08da263..17118ab 100644
--- a/src/property.h
+++ b/src/property.h
@@ -227,6 +227,7 @@ public:
     PropertyType getDataType() { return Property<T>::getStaticPropertyType(); }
 
     std::vector<T> &getValueRef() { return value; }
+    const std::vector<T> &getValueRef() const { return value; }
 
     unsigned int getArraySize() { return value.size(); }
 };