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diff --git a/test-suite/bugs/closed/3633.v b/test-suite/bugs/closed/3633.v
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+Set Typeclasses Strict Resolution.
+Class Contr (A : Type) := { center : A }.
+Definition foo {A} `{Contr A} : A.
+Proof.
+  apply center.
+  Undo.
+  (* Ensure the constraints are solved independently, otherwise a frozen ?A 
+  makes a search for Contr ?A fail when finishing to apply (fun x => x) *)
+  apply (fun x => x), center. 
+Qed.
+\ No newline at end of file