diff --git a/preprocessor/ComputingTasks.cc b/preprocessor/ComputingTasks.cc
index 18d54db99..7fc5d59ef 100644
--- a/preprocessor/ComputingTasks.cc
+++ b/preprocessor/ComputingTasks.cc
@@ -223,6 +223,29 @@ ForecastStatement::ForecastStatement(const SymbolList &symbol_list_arg,
 {
 }
 
+Statement *
+ForecastStatement::cloneAndReindexSymbIds(DataTree &dynamic_datatree, SymbolTable &orig_symbol_table)
+{
+  SymbolList new_symbol_list;
+  try
+    {
+      SymbolTable *new_symbol_table =  dynamic_datatree.getSymbolTable();
+      vector<string> symbols = symbol_list.get_symbols();
+      for (vector<string>::const_iterator it = symbols.begin(); it != symbols.end(); it++)
+        {
+          new_symbol_table->getID(*it);
+          new_symbol_list.addSymbol(*it);
+        }
+    }
+  catch (SymbolTable::UnknownSymbolNameException &e)
+    {
+      cerr << "ERROR: A variable in the forecast statement was not found in the symbol table" << endl
+           << "       This likely means that you have declared a varexo that is not used in the model" << endl;
+      exit(EXIT_FAILURE);
+    }
+  return new ForecastStatement(new_symbol_list, options_list);
+}
+
 void
 ForecastStatement::writeOutput(ostream &output, const string &basename) const
 {
diff --git a/preprocessor/ComputingTasks.hh b/preprocessor/ComputingTasks.hh
index d84ef1afa..bc7dbcb19 100644
--- a/preprocessor/ComputingTasks.hh
+++ b/preprocessor/ComputingTasks.hh
@@ -109,6 +109,7 @@ public:
   ForecastStatement(const SymbolList &symbol_list_arg,
                     const OptionsList &options_list_arg);
   virtual void writeOutput(ostream &output, const string &basename) const;
+  virtual Statement *cloneAndReindexSymbIds(DataTree &dynamic_datatree, SymbolTable &orig_symbol_table);
 };
 
 class RamseyModelStatement : public Statement