diff --git a/src/mlpack/core/metrics/bleu_impl.hpp b/src/mlpack/core/metrics/bleu_impl.hpp
index 27119bef1e..f81d62c69a 100644
--- a/src/mlpack/core/metrics/bleu_impl.hpp
+++ b/src/mlpack/core/metrics/bleu_impl.hpp
@@ -180,7 +180,7 @@ ElemType BLEU<ElemType, PrecisionType>::Evaluate(
 
   ratio = ElemType(translationLength);
   if (referenceLength > 0)
-    ration /= referenceLength;
+    ratio /= referenceLength;
 
   brevityPenalty = (ratio > 1.0) ? 1.0 : std::exp(1.0 - 1.0 / ratio);
   bleuScore = geometricMean * brevityPenalty;