diff --git a/mert/Scorer.h b/mert/Scorer.h
index a08fc436d..a02d02c59 100644
--- a/mert/Scorer.h
+++ b/mert/Scorer.h
@@ -47,11 +47,16 @@ public:
   virtual float calculateScore(const std::vector<ScoreStatsType>& totals) const = 0;
 
   float calculateSentenceLevelBackgroundScore(const std::vector<ScoreStatsType>& totals, const std::vector<ScoreStatsType>& bg) {
-    std::vector<ScoreStatsType> stats(totals.size());
-    for(size_t i=0; i<stats.size(); i++)
-      stats[i] = totals[i]+bg[i];
-    // Get score and scale by reference length (as per Chiang et al 08)
-    return calculateScore(stats) * getReferenceLength(stats);
+	if (m_name.compare("CHRF")!=0){
+		std::vector<ScoreStatsType> stats(totals.size());
+   for(size_t i=0; i<stats.size(); i++)
+       stats[i] = totals[i]+bg[i];
+   // Get score and scale by reference length (as per Chiang et al 08)
+   return calculateScore(stats) * getReferenceLength(stats);
+	}
+	else{
+		return calculateScore(totals);
+	}
   }
 
   /**
diff --git a/mert/ScorerFactory.cpp b/mert/ScorerFactory.cpp
index 8827f3e5d..d93e851fc 100644
--- a/mert/ScorerFactory.cpp
+++ b/mert/ScorerFactory.cpp
@@ -6,6 +6,7 @@
 #include "BleuDocScorer.h"
 #include "PerScorer.h"
 #include "TerScorer.h"
+#include "CHRFScorer.h"
 #include "CderScorer.h"
 #include "InterpolatedScorer.h"
 #include "SemposScorer.h"
@@ -29,6 +30,7 @@ vector<string> ScorerFactory::getTypes()
   types.push_back(string("PER"));
   types.push_back(string("TER"));
   types.push_back(string("CDER"));
+  types.push_back(string("CHRF"));
   types.push_back(string("WER"));
   types.push_back(string("MERGE"));
   types.push_back(string("SEMPOS"));
@@ -62,6 +64,8 @@ Scorer* ScorerFactory::getScorer(const string& type, const string& config)
     return (PermutationScorer*) new PermutationScorer(type, config);
   } else if (type == "METEOR") {
     return new MeteorScorer(config);
+  } else if (type == "CHRF") {
+    return new CHRFScorer(config);
   } else if (type == "HWCM") {
     return new HwcmScorer(config);
   } else {
diff --git a/mert/kbmira.cpp b/mert/kbmira.cpp
index 025602041..d060d2679 100644
--- a/mert/kbmira.cpp
+++ b/mert/kbmira.cpp
@@ -43,6 +43,7 @@ de recherches du Canada
 #include "util/random.hh"
 
 #include "BleuScorer.h"
+#include "CHRFScorer.h"
 #include "HopeFearDecoder.h"
 #include "MiraFeatureVector.h"
 #include "MiraWeightVector.h"