diff --git a/sci-mathematics/manifold/manifold-3.1.0.ebuild b/sci-mathematics/manifold/manifold-3.1.0-r1.ebuild
similarity index 99%
rename from sci-mathematics/manifold/manifold-3.1.0.ebuild
rename to sci-mathematics/manifold/manifold-3.1.0-r1.ebuild
index 2ae1d1bc7f879..6c93ca9542720 100644
--- a/sci-mathematics/manifold/manifold-3.1.0.ebuild
+++ b/sci-mathematics/manifold/manifold-3.1.0-r1.ebuild
@@ -25,7 +25,7 @@ else
 fi
 
 LICENSE="Apache-2.0"
-SLOT="0"
+SLOT="0/1"
 
 IUSE="debug python +tbb test"
 REQUIRED_USE="python? ( ${PYTHON_REQUIRED_USE} )"
diff --git a/sci-mathematics/manifold/manifold-9999.ebuild b/sci-mathematics/manifold/manifold-9999.ebuild
index 2854b6b9e837d..2f9ced603aaed 100644
--- a/sci-mathematics/manifold/manifold-9999.ebuild
+++ b/sci-mathematics/manifold/manifold-9999.ebuild
@@ -25,7 +25,7 @@ else
 fi
 
 LICENSE="Apache-2.0"
-SLOT="0"
+SLOT="0/1"
 
 IUSE="debug python +tbb test"
 REQUIRED_USE="python? ( ${PYTHON_REQUIRED_USE} )"