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diff --git a/moses/src/ChartTrellisDetour.cpp b/moses/src/ChartTrellisDetour.cpp
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+++ b/moses/src/ChartTrellisDetour.cpp
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+/***********************************************************************
+ Moses - statistical machine translation system
+ Copyright (C) 2006-2011 University of Edinburgh
+ 
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+ 
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+ 
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+***********************************************************************/
+
+#include "ChartTrellisDetour.h"
+
+#include "ChartHypothesis.h"
+#include "ChartTrellisNode.h"
+#include "ChartTrellisPath.h"
+
+namespace Moses
+{
+
+ChartTrellisDetour::ChartTrellisDetour(
+    boost::shared_ptr<const ChartTrellisPath> basePath,
+    const ChartTrellisNode &substitutedNode,
+    const ChartHypothesis &replacementHypo)
+  : m_basePath(basePath)
+  , m_substitutedNode(substitutedNode)
+  , m_replacementHypo(replacementHypo)
+{
+  float diff = replacementHypo.GetTotalScore()
+             - substitutedNode.GetHypothesis().GetTotalScore();
+  m_totalScore = basePath->GetTotalScore() + diff;
+}
+
+}  // namespace Moses