diff --git a/trainer/src/MacaonTrain.cpp b/trainer/src/MacaonTrain.cpp
index f9ded4f7e9200b393fc905dc26579897ea781f43..2c9ef09590f49fe6501a1721b1f02753ee05e8b6 100644
--- a/trainer/src/MacaonTrain.cpp
+++ b/trainer/src/MacaonTrain.cpp
@@ -35,7 +35,7 @@ po::options_description MacaonTrain::getOptionsDescription()
       "Number of examples per batch")
     ("dynamicOracleInterval", po::value<int>()->default_value(-1),
       "Number of examples per batch")
-    ("rarityThreshold", po::value<float>()->default_value(20.0),
+    ("rarityThreshold", po::value<float>()->default_value(70.0),
       "During train, the X% rarest elements will be treated as unknown values")
     ("machine", po::value<std::string>()->default_value(""),
       "Reading machine file content")