diff --git a/net-irc/znc/znc-1.6.4.ebuild b/net-irc/znc/znc-1.6.4.ebuild
index f8a3449fa206e..f7530b740a078 100644
--- a/net-irc/znc/znc-1.6.4.ebuild
+++ b/net-irc/znc/znc-1.6.4.ebuild
@@ -21,7 +21,7 @@ KEYWORDS="~amd64 ~arm ~x86"
 HOMEPAGE="http://znc.in"
 LICENSE="Apache-2.0"
 SLOT="0"
-IUSE="daemon debug ipv6 icu libressl perl python ssl sasl tcl test zlib"
+IUSE="daemon debug +ipv6 +icu libressl perl python +ssl sasl tcl test +zlib"
 
 REQUIRED_USE="python? ( ${PYTHON_REQUIRED_USE} )"