diff --git a/modules/gmt/modgmt_func.cpp b/modules/gmt/modgmt_func.cpp
index 30c1f28..43dd00b 100644
--- a/modules/gmt/modgmt_func.cpp
+++ b/modules/gmt/modgmt_func.cpp
@@ -22,10 +22,11 @@ class Base2Something: public OBTypeM<Func,O...>
  Base2Something(const ObjectBase* arg):OBTypeM<Func,O...>(arg) {};
  Base2Something(const ObjectList* input, const std::string& name):OBTypeM<Func,O...>(input->Get(name)){};
  Base2Something(const ObjectList* input, const ObjectList::ListValues::size_type i):OBTypeM<Func,O...>((i<input->Size())?input->At(i):0){}; // Check index, because At is not safe
- auto operator ()(bool* b) const -> decltype(this->OBTypeM<Func,O...>::template operator()<bool*>(b))
+ template<class... Args>
+ auto operator ()(bool* b, Args... args) const -> decltype(this->OBTypeM<Func,O...>::template operator()<bool*, Args...>(b, args...))
  {
   if(!OBTypeM<Func,O...>::operator bool()) *b=false;
-  return OBTypeM<Func,O...>::operator ()(b);
+  return OBTypeM<Func,O...>::operator ()(b,args...);
  }
 };