diff --git a/packages/conf-gmp/conf-gmp.1/opam b/packages/conf-gmp/conf-gmp.1/opam
index 68671a81f38e..e1fe4ba48eb8 100644
--- a/packages/conf-gmp/conf-gmp.1/opam
+++ b/packages/conf-gmp/conf-gmp.1/opam
@@ -27,7 +27,7 @@ synopsis: "Virtual package relying on a GMP lib system installation"
 description:
   "This package can only install if the GMP lib is installed on the system."
 authors: "nbraud"
-flags: conf
+flags: [conf avoid-version]
 extra-source "test.c" {
   src:
     "https://raw.githubusercontent.com/ocaml/opam-source-archives/main/patches/conf-gmp/test.c.1"