diff --git a/include/core/problem/problem.h b/include/core/problem/problem.h
index 44e2fe69ed430b624e3df31dfa730341b496fe90..5ab5f053fee0c4559a4f8fd473dee43777f54197 100644
--- a/include/core/problem/problem.h
+++ b/include/core/problem/problem.h
@@ -69,7 +69,6 @@ class Problem : public std::enable_shared_from_this<Problem>
         PriorOptionsPtr prior_options_;
 
     private: // CAUTION: THESE METHODS ARE PRIVATE, DO NOT MAKE THEM PUBLIC !!
-        Problem(const std::string& _frame_structure); // USE create() below !!
         Problem(const std::string& _frame_structure, SizeEigen _dim); // USE create() below !!
         void setup();