diff --git a/Shocks.cc b/Shocks.cc
index a909cb15..432f7dcd 100644
--- a/Shocks.cc
+++ b/Shocks.cc
@@ -289,9 +289,9 @@ ConditionalForecastPathsStatement::writeOutput(ostream &output, const string &ba
        it != paths.end(); it++)
     {
       if (it == paths.begin())
-        output << "constrained_vars_ = " << it->first << ";" << endl;
+        output << "constrained_vars_ = " << it->first +1 << ";" << endl;
       else
-        output << "constrained_vars_ = [constrained_vars_; " << it->first << "];" << endl;
+        output << "constrained_vars_ = [constrained_vars_; " << it->first +1 << "];" << endl;
 
       const vector<AbstractShocksStatement::DetShockElement> &elems = it->second;
       for (int i = 0; i < (int) elems.size(); i++)