diff --git a/opam b/opam
index d633f9ff..f51a13c0 100644
--- a/opam
+++ b/opam
@@ -35,6 +35,8 @@ depends: [
 depopts: [ "sequence" "base-bigarray" "base-unix" "base-threads" ]
 conflicts: [
   "sequence" { < "0.5" }
+  "qtest" { < "2.2" }
+  "qcheck"
 ]
 tags: [ "stdlib" "containers" "iterators" "list" "heap" "queue" ]
 homepage: "https://github.com/c-cube/ocaml-containers/"