diff --git a/ExprNode.cc b/ExprNode.cc
index 687b6bde75aa68a2c39243b806672dae8d52ae45..cb6c94dc8f63824a867f9f76a64797a5b09776f0 100644
--- a/ExprNode.cc
+++ b/ExprNode.cc
@@ -7454,7 +7454,7 @@ PacExpectationNode::writeOutput(ostream &output, ExprNodeOutputType output_type,
           output << "'exogenous';" << endl;
           break;
         case eParameter:
-          output << "'exogenous';" << endl;
+          output << "'parameter';" << endl;
           break;
         default:
           cerr << "pac_expectation: error encountered in growth type" << endl;