diff --git a/src/ServiceToolkit/src/SIL.ServiceToolkit/Services/CorpusService.cs b/src/ServiceToolkit/src/SIL.ServiceToolkit/Services/CorpusService.cs
index dcabcd2d..793e5046 100644
--- a/src/ServiceToolkit/src/SIL.ServiceToolkit/Services/CorpusService.cs
+++ b/src/ServiceToolkit/src/SIL.ServiceToolkit/Services/CorpusService.cs
@@ -40,7 +40,7 @@ public IEnumerable<ITextCorpus> CreateTermCorpora(
         IReadOnlyList<(CorpusFile File, Dictionary<string, HashSet<int>> Chapters)> corpora
     )
     {
-        foreach ((CorpusFile file, Dictionary<string, HashSet<int>>? chapters) in corpora)
+        foreach ((CorpusFile file, Dictionary<string, HashSet<int>> chapters) in corpora)
         {
             switch (file.Format)
             {