diff --git a/net-dns/unbound/unbound-1.5.10.ebuild b/net-dns/unbound/unbound-1.5.10.ebuild
index 9d02d2e869649..41a6d5949ce65 100644
--- a/net-dns/unbound/unbound-1.5.10.ebuild
+++ b/net-dns/unbound/unbound-1.5.10.ebuild
@@ -24,7 +24,7 @@ REQUIRED_USE="python? ( ${PYTHON_REQUIRED_USE} )"
 # is fixed.
 
 CDEPEND=">=dev-libs/expat-2.1.0-r3[${MULTILIB_USEDEP}]
-	>=dev-libs/libevent-2.0.21[${MULTILIB_USEDEP}]
+	>=dev-libs/libevent-2.0.21:0=[${MULTILIB_USEDEP}]
 	libressl? ( >=dev-libs/libressl-2.2.4:0[${MULTILIB_USEDEP}] )
 	!libressl? ( >=dev-libs/openssl-1.0.1h-r2:0[${MULTILIB_USEDEP}] )
 	dnstap? (