diff --git a/dev-ml/bignum/bignum-0.9.0.ebuild b/dev-ml/bignum/bignum-0.9.0.ebuild
index ea3309a76a5bd..a2a5971bed663 100644
--- a/dev-ml/bignum/bignum-0.9.0.ebuild
+++ b/dev-ml/bignum/bignum-0.9.0.ebuild
@@ -20,6 +20,8 @@ RDEPEND="
 	dev-ml/ppx_jane:=
 	dev-ml/typerep:=
 	dev-ml/zarith:=
+	<dev-ml/ppx_driver-100
+	<dev-ml/ppx_jane-100
 "
 DEPEND="${RDEPEND} dev-ml/opam dev-ml/jbuilder"