diff --git a/dev-ml/ptmap/ptmap-2.0.5.ebuild b/dev-ml/ptmap/ptmap-2.0.5-r1.ebuild
similarity index 96%
rename from dev-ml/ptmap/ptmap-2.0.5.ebuild
rename to dev-ml/ptmap/ptmap-2.0.5-r1.ebuild
index 3e7cb033f9b1a..161912516ff7b 100644
--- a/dev-ml/ptmap/ptmap-2.0.5.ebuild
+++ b/dev-ml/ptmap/ptmap-2.0.5-r1.ebuild
@@ -10,7 +10,7 @@ HOMEPAGE="https://github.com/backtracking/ptmap"
 SRC_URI="https://github.com/backtracking/${PN}/archive/${PV}.tar.gz -> ${P}.tar.gz"
 
 LICENSE="LGPL-2.1"
-SLOT="0"
+SLOT="0/${PV}"
 KEYWORDS="~amd64 ~x86"
 IUSE="+ocamlopt"