diff --git a/dev-libs/concurrencykit/concurrencykit-0.5.2.ebuild b/dev-libs/concurrencykit/concurrencykit-0.5.2.ebuild
index 178422abf6350..75b0b9bf0c78e 100644
--- a/dev-libs/concurrencykit/concurrencykit-0.5.2.ebuild
+++ b/dev-libs/concurrencykit/concurrencykit-0.5.2.ebuild
@@ -14,4 +14,8 @@ LICENSE="Apache-2.0 BSD-2"
 SLOT="0"
 KEYWORDS="amd64 x86"
 
+# libck.so name collision #616762
+# these packages have nothing in common
+RDEPEND="!sys-cluster/charm"
+
 S="${WORKDIR}/${MY_P}"
diff --git a/dev-libs/concurrencykit/concurrencykit-0.6.0.ebuild b/dev-libs/concurrencykit/concurrencykit-0.6.0.ebuild
index 178422abf6350..75b0b9bf0c78e 100644
--- a/dev-libs/concurrencykit/concurrencykit-0.6.0.ebuild
+++ b/dev-libs/concurrencykit/concurrencykit-0.6.0.ebuild
@@ -14,4 +14,8 @@ LICENSE="Apache-2.0 BSD-2"
 SLOT="0"
 KEYWORDS="amd64 x86"
 
+# libck.so name collision #616762
+# these packages have nothing in common
+RDEPEND="!sys-cluster/charm"
+
 S="${WORKDIR}/${MY_P}"