diff --git a/tests/SIL.Machine.Tests/Corpora/AlignedWordPairTests.cs b/tests/SIL.Machine.Tests/Corpora/AlignedWordPairTests.cs
index 578cd271..2925db34 100644
--- a/tests/SIL.Machine.Tests/Corpora/AlignedWordPairTests.cs
+++ b/tests/SIL.Machine.Tests/Corpora/AlignedWordPairTests.cs
@@ -21,6 +21,11 @@ public void TryParse_Success()
         Assert.That(alignedWordPairs, Has.Count.EqualTo(1));
         Assert.That(alignedWordPairs.First().TranslationScore, Is.EqualTo(0.111111));
         Assert.That(alignedWordPairs.First().AlignmentScore, Is.EqualTo(-1));
+        alignmentString = "1-0";
+        Assert.That(AlignedWordPair.TryParse(alignmentString, out alignedWordPairs), Is.True);
+        Assert.That(alignedWordPairs, Has.Count.EqualTo(1));
+        Assert.That(alignedWordPairs.First().TranslationScore, Is.EqualTo(-1));
+        Assert.That(alignedWordPairs.First().AlignmentScore, Is.EqualTo(-1));
     }
 
     [Test]