diff --git a/test/DiffSummarySpec.hs b/test/DiffSummarySpec.hs
index 7157c2f0a..144c32dc2 100644
--- a/test/DiffSummarySpec.hs
+++ b/test/DiffSummarySpec.hs
@@ -93,6 +93,7 @@ isIndexedOrFixed' :: Syntax a f -> Bool
 isIndexedOrFixed' syntax = case syntax of
   (Indexed _) -> True
   (Fixed _) -> True
+  (Commented _ _) -> True
   _ -> False
 
 isBranchNode :: Patch DiffInfo -> Bool