diff --git a/src/algs/ags/solver.cc b/src/algs/ags/solver.cc
index 1e4b0030..95c70613 100644
--- a/src/algs/ags/solver.cc
+++ b/src/algs/ags/solver.cc
@@ -341,7 +341,7 @@ void NLPSolver::UpdateH(double newValue, int index)
   }
 }
 
-void NLPSolver::UpdateAllH(std::set<Interval*>::iterator iterator)
+void NLPSolver::UpdateAllH(std::set<Interval*, ags::CompareIntervals>::iterator iterator)
 {
   Interval* pInterval = *iterator;
   if (pInterval->pl.idx < 0)
diff --git a/src/algs/ags/solver.hpp b/src/algs/ags/solver.hpp
index 4c57df46..dd4bf42f 100644
--- a/src/algs/ags/solver.hpp
+++ b/src/algs/ags/solver.hpp
@@ -79,7 +79,7 @@ class NLPSolver
   void InitDataStructures();
   void ClearDataStructures();
 
-  void UpdateAllH(std::set<Interval*>::iterator);
+  void UpdateAllH(std::set<Interval*, ags::CompareIntervals>::iterator);
   void UpdateH(double newValue, int index);
   double CalculateR(Interval*) const;
   double GetNextPointCoordinate(Interval*) const;