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diff --git a/src/expr/uninterpreted_constant.cpp b/src/expr/uninterpreted_constant.cpp
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+++ b/src/expr/uninterpreted_constant.cpp
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+/*********************                                                        */
+/*! \file uninterpreted_constant.cpp
+ ** \verbatim
+ ** Original author: Morgan Deters
+ ** Major contributors: none
+ ** Minor contributors (to current version): none
+ ** This file is part of the CVC4 project.
+ ** Copyright (c) 2009-2014  New York University and The University of Iowa
+ ** See the file COPYING in the top-level source directory for licensing
+ ** information.\endverbatim
+ **
+ ** \brief Representation of constants of uninterpreted sorts
+ **
+ ** Representation of constants of uninterpreted sorts.
+ **/
+
+#include "expr/uninterpreted_constant.h"
+
+#include <iostream>
+#include <sstream>
+#include <string>
+
+using namespace std;
+
+namespace CVC4 {
+
+std::ostream& operator<<(std::ostream& out, const UninterpretedConstant& uc) {
+  stringstream ss;
+  ss << uc.getType();
+  string t = ss.str();
+  size_t i = 0;
+  // replace everything that isn't in [a-zA-Z0-9_] with an _
+  while((i = t.find_first_not_of("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890_", i)) != string::npos) {
+    t.replace(i, 1, 1, '_');
+  }
+  return out << "uc_" << t << '_' << uc.getIndex();
+}
+
+}/* CVC4 namespace */