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diff --git a/test-suite/success/cbn.v b/test-suite/success/cbn.v
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+(* cbn is able to refold mutual recursive calls *)
+
+Fixpoint foo (n : nat) :=
+  match n with
+  | 0 => true
+  | S n => g n
+  end
+with g (n : nat) : bool :=
+  match n with
+  | 0 => true
+  | S n => foo n
+  end.
+Goal forall n, foo (S n) = g n.
+  intros. cbn.
+  match goal with
+    |- g _ = g _ => reflexivity
+  end.
+Qed.