diff --git a/include/chaiscript/language/chaiscript_engine.hpp b/include/chaiscript/language/chaiscript_engine.hpp
index df46d6d..ebb7b1e 100644
--- a/include/chaiscript/language/chaiscript_engine.hpp
+++ b/include/chaiscript/language/chaiscript_engine.hpp
@@ -71,6 +71,8 @@ namespace chaiscript
         ChaiScript_System &add(const ModulePtr &p)
         {
             engine.add(p);
+
+            return *this;
         }
 
         /**