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diff --git a/src/theory/arith/constraint_forward.h b/src/theory/arith/constraint_forward.h
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+/*********************                                                        */
+/*! \file constraint_forward.h
+ ** \verbatim
+ ** Original author: taking
+ ** Major contributors: none
+ ** Minor contributors (to current version): none
+ ** This file is part of the CVC4 prototype.
+ ** Copyright (c) 2009, 2010, 2011  The Analysis of Computer Systems Group (ACSys)
+ ** Courant Institute of Mathematical Sciences
+ ** New York University
+ ** See the file COPYING in the top-level source directory for licensing
+ ** information.\endverbatim
+ **
+ ** \brief Forward declarations of the ConstraintValue and ConstraintDatabase classes.
+ **
+ ** This is the forward declarations of the ConstraintValue and ConstraintDatabase
+ ** and the typedef for Constraint.  This is used to break circular dependencies and
+ ** minimize interaction between header files.
+ **/
+
+#include "cvc4_private.h"
+
+#ifndef __CVC4__THEORY__ARITH__CONSTRAINT_FORWARD_H
+#define __CVC4__THEORY__ARITH__CONSTRAINT_FORWARD_H
+
+namespace CVC4 {
+namespace theory {
+namespace arith {
+
+class ConstraintValue;
+typedef ConstraintValue* Constraint;
+typedef const ConstraintValue* const ConstConstraint;
+
+static const Constraint NullConstraint = NULL;
+
+class ConstraintDatabase;
+
+}/* CVC4::theory::arith namespace */
+}/* CVC4::theory namespace */
+}/* CVC4 namespace */
+
+#endif /* __CVC4__THEORY__ARITH__CONSTRAINT_FORWARD_H */