diff --git a/reading_machine/src/Transition.cpp b/reading_machine/src/Transition.cpp
index a66ba5365d341e788ecc791b93cba32b730c8ac2..cd652c5b7e08b728bbf99ecee3ae9b1804b1a546 100644
--- a/reading_machine/src/Transition.cpp
+++ b/reading_machine/src/Transition.cpp
@@ -84,7 +84,7 @@ void Transition::initShift()
 
   cost = [](const Config & config)
   {
-    if (config.isToken(config.getWordIndex()))
+    if (!config.isToken(config.getWordIndex()))
       return 0;
 
     auto headGov = config.getConst(Config::headColName, config.getWordIndex(), 0);