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diff --git a/test-suite/bugs/closed/bug_9598.v b/test-suite/bugs/closed/bug_9598.v
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index 0000000000..00bbfcf5d9
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+++ b/test-suite/bugs/closed/bug_9598.v
@@ -0,0 +1,36 @@
+Module case.
+
+  Inductive pair := K (n1 : nat) (n2 : nat).
+  Definition fst (p : pair) : nat := match p with K n _ => n end.
+
+  Definition alias_K a b := K a b.
+
+  Fixpoint rec (x : nat) : nat := fst (K 0 (rec x)).
+  Fixpoint rec_ko (x : nat) : nat := fst (alias_K 0 (rec_ko x)).
+
+End case.
+
+Module fixpoint.
+
+  Inductive pair := K (n1 : nat) (n2 : nat).
+  Fixpoint fst (p : pair) : nat := match p with K n _ => n end.
+
+  Definition alias_K a b := K a b.
+
+  Fixpoint rec (x : nat) : nat := fst (K 0 (rec x)).
+  Fixpoint rec_ko (x : nat) : nat := fst (alias_K 0 (rec_ko x)).
+
+End fixpoint.
+
+Module primproj.
+
+  Set Primitive Projections.
+
+  Inductive pair := K { fst : nat; snd : nat }.
+
+  Definition alias_K a b := K a b.
+
+  Fixpoint rec (x : nat) : nat := fst (K 0 (rec x)).
+  Fixpoint rec_ko (x : nat) : nat := fst (alias_K 0 (rec_ko x)).
+
+End primproj.