diff --git a/DynamicModel.cc b/DynamicModel.cc
index d4d37156..c33db502 100644
--- a/DynamicModel.cc
+++ b/DynamicModel.cc
@@ -4020,7 +4020,7 @@ DynamicModel::substituteLeadLagInternal(aux_var_t type, bool deterministic_model
   //  - lead variables from lower lead to higher lead (need to be listed in reverse order)
   //  - lag variables from lower lag to higher lag
   if ((type == avEndoLead) || (type == avExoLead))
-    copy(neweqs.rbegin(), neweqs.rend(), back_inserter(aux_equations));
+    copy(neweqs.begin(), neweqs.end(), back_inserter(aux_equations));
   else
     copy(neweqs.begin(), neweqs.end(), back_inserter(aux_equations));