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diff --git a/src/base/lemma_input_channel_forward.h b/src/base/lemma_input_channel_forward.h
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+/*********************                                                        */
+/*! \file lemma_input_channel_forward.h
+ ** \verbatim
+ ** Original author: Tim King
+ ** 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 Forward declaration of LemmaInputChannel.
+ **
+ ** This forward declaration of LemmaInputChannel is needed for the option
+ ** lemmaInputChannel (defined in smt_options) can be a LemmaInputChannel*
+ ** without including expr.h.
+ **/
+
+#include "cvc4_public.h"
+
+#ifndef __CVC4__LEMMA_INPUT_CHANNEL_FORWARD_H
+#define __CVC4__LEMMA_INPUT_CHANNEL_FORWARD_H
+
+namespace CVC4 {
+
+class CVC4_PUBLIC LemmaInputChannel;
+
+}/* CVC4 namespace */
+
+#endif /* __CVC4__LEMMA_INPUT_CHANNEL_FORWARD_H */