diff --git a/dev-ml/ocaml-cstruct/ocaml-cstruct-1.7.0.ebuild b/dev-ml/ocaml-cstruct/ocaml-cstruct-1.7.0-r1.ebuild
similarity index 98%
rename from dev-ml/ocaml-cstruct/ocaml-cstruct-1.7.0.ebuild
rename to dev-ml/ocaml-cstruct/ocaml-cstruct-1.7.0-r1.ebuild
index b137031b31f8a..ee6b40d335d97 100644
--- a/dev-ml/ocaml-cstruct/ocaml-cstruct-1.7.0.ebuild
+++ b/dev-ml/ocaml-cstruct/ocaml-cstruct-1.7.0-r1.ebuild
@@ -13,7 +13,7 @@ HOMEPAGE="https://github.com/mirage/ocaml-cstruct https://mirage.io"
 SRC_URI="https://github.com/mirage/${PN}/archive/v${PV}.tar.gz -> ${P}.tar.gz"
 
 LICENSE="ISC"
-SLOT="0"
+SLOT="0/${PV}"
 KEYWORDS="~amd64"
 IUSE="async camlp4 lwt"
 
diff --git a/dev-ml/ocaml-uri/ocaml-uri-1.9.1.ebuild b/dev-ml/ocaml-uri/ocaml-uri-1.9.1-r1.ebuild
similarity index 97%
rename from dev-ml/ocaml-uri/ocaml-uri-1.9.1.ebuild
rename to dev-ml/ocaml-uri/ocaml-uri-1.9.1-r1.ebuild
index e10f5b6c57b70..373e810ed77e7 100644
--- a/dev-ml/ocaml-uri/ocaml-uri-1.9.1.ebuild
+++ b/dev-ml/ocaml-uri/ocaml-uri-1.9.1-r1.ebuild
@@ -13,7 +13,7 @@ HOMEPAGE="https://github.com/mirage/ocaml-uri https://mirage.io"
 SRC_URI="https://github.com/mirage/${PN}/archive/v${PV}.tar.gz -> ${P}.tar.gz"
 
 LICENSE="ISC"
-SLOT="0"
+SLOT="0/${PV}"
 KEYWORDS="~amd64"
 IUSE="allservices"
 
diff --git a/dev-ml/ocplib-endian/ocplib-endian-0.8.ebuild b/dev-ml/ocplib-endian/ocplib-endian-0.8-r1.ebuild
similarity index 97%
rename from dev-ml/ocplib-endian/ocplib-endian-0.8.ebuild
rename to dev-ml/ocplib-endian/ocplib-endian-0.8-r1.ebuild
index 445b2f8b8bda8..675b5221f610d 100644
--- a/dev-ml/ocplib-endian/ocplib-endian-0.8.ebuild
+++ b/dev-ml/ocplib-endian/ocplib-endian-0.8-r1.ebuild
@@ -12,7 +12,7 @@ HOMEPAGE="https://github.com/OCamlPro/ocplib-endian"
 SRC_URI="https://github.com/OCamlPro/${PN}/archive/${PV}.tar.gz -> ${P}.tar.gz"
 
 LICENSE="LGPL-2.1-with-linking-exception"
-SLOT="0"
+SLOT="0/${PV}"
 KEYWORDS="~amd64"
 IUSE=""
 
diff --git a/dev-ml/stringext/stringext-1.4.0.ebuild b/dev-ml/stringext/stringext-1.4.0-r1.ebuild
similarity index 97%
rename from dev-ml/stringext/stringext-1.4.0.ebuild
rename to dev-ml/stringext/stringext-1.4.0-r1.ebuild
index adba47074d8e6..25377ced513bb 100644
--- a/dev-ml/stringext/stringext-1.4.0.ebuild
+++ b/dev-ml/stringext/stringext-1.4.0-r1.ebuild
@@ -12,7 +12,7 @@ HOMEPAGE="https://github.com/rgrinberg/stringext"
 SRC_URI="https://github.com/rgrinberg/${PN}/archive/v${PV}.tar.gz -> ${P}.tar.gz"
 
 LICENSE="MIT"
-SLOT="0"
+SLOT="0/${PV}"
 KEYWORDS="~amd64"
 IUSE=""