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diff --git a/test-suite/bugs/closed/bug_4771.v b/test-suite/bugs/closed/bug_4771.v
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index 0000000000..e25e5a1be5
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+++ b/test-suite/bugs/closed/bug_4771.v
@@ -0,0 +1,21 @@
+(* The following code used to trigger an anomaly in functor substitutions *)
+
+Module Type Foo.
+
+Parameter Inline t : nat.
+
+End Foo.
+
+Module F(X : Foo).
+
+Tactic Notation "foo" ref(x) := idtac.
+
+Ltac g := foo X.t.
+
+End F.
+
+Module N.
+Definition t := 0 + 0.
+End N.
+
+Module K := F(N).