diff --git a/src/SIL.Machine.Morphology.HermitCrab/Morpher.cs b/src/SIL.Machine.Morphology.HermitCrab/Morpher.cs
index c6c58a91..1638941a 100644
--- a/src/SIL.Machine.Morphology.HermitCrab/Morpher.cs
+++ b/src/SIL.Machine.Morphology.HermitCrab/Morpher.cs
@@ -364,9 +364,9 @@ private IEnumerable<Word> LexicalGuess(Word input)
                 _traceManager.LexicalLookup(input.Stratum, input);
             CharacterDefinitionTable table = input.Stratum.CharacterDefinitionTable;
             IEnumerable<ShapeNode> shapeNodes = input.Shape.GetNodes(input.Range);
-            HashSet<string> shapeSet = new HashSet<string>();
             foreach (RootAllomorph lexicalPattern in _lexicalPatterns)
             {
+                HashSet<string> shapeSet = new HashSet<string>();
                 IEnumerable<ShapeNode> shapePattern = lexicalPattern.Segments.Shape.GetNodes(
                     lexicalPattern.Segments.Shape.Range
                 );