diff --git a/src/DiffSummary.hs b/src/DiffSummary.hs
index bc63299cd..9defc2afd 100644
--- a/src/DiffSummary.hs
+++ b/src/DiffSummary.hs
@@ -61,6 +61,7 @@ identifiable term = isIdentifiable (unwrap term) term
           S.Rescue{} -> Identifiable
           S.Pair{} -> Identifiable
           S.Struct{} -> Identifiable
+          S.Case{} -> Identifiable
           S.Array ty _ -> if isJust ty then Identifiable else Unidentifiable
           S.Object ty _ -> if isJust ty then Identifiable else Unidentifiable
           S.BlockStatement{} -> Identifiable