diff --git a/src/UglyToad.PdfPig/Util/DefaultWordExtractor.cs b/src/UglyToad.PdfPig/Util/DefaultWordExtractor.cs
index e4c9ad7d..89f41b6b 100644
--- a/src/UglyToad.PdfPig/Util/DefaultWordExtractor.cs
+++ b/src/UglyToad.PdfPig/Util/DefaultWordExtractor.cs
@@ -96,7 +96,7 @@
 
         private static Word GenerateWord(List<Letter> letters)
         {
-            return new Word(letters);
+            return new Word(letters.ToList());
         }
 
         public static IWordExtractor Instance { get; } = new DefaultWordExtractor();