diff --git a/dev-ada/xmlada/xmlada-2018.ebuild b/dev-ada/xmlada/xmlada-2018.ebuild
index 04866d734b835..1e07327ae8927 100644
--- a/dev-ada/xmlada/xmlada-2018.ebuild
+++ b/dev-ada/xmlada/xmlada-2018.ebuild
@@ -17,13 +17,15 @@ SLOT="0"
 KEYWORDS="~amd64 ~x86"
 IUSE="gnat_2016 gnat_2017 +gnat_2018 +shared static-libs static-pic"
 REQUIRED_USE="|| ( shared static-libs static-pic )
-	!gnat_2016 ^^ ( gnat_2017 gnat_2018 )"
+	^^ ( gnat_2016 gnat_2017 gnat_2018 )"
 
 RDEPEND="gnat_2016? ( dev-lang/gnat-gpl:4.9.4 )
 	gnat_2017? ( dev-lang/gnat-gpl:6.3.0 )
 	gnat_2018? ( dev-lang/gnat-gpl:7.3.1 )"
 DEPEND="${RDEPEND}
-	dev-ada/gprbuild[gnat_2016=,gnat_2017=,gnat_2018=]"
+	dev-ada/gprbuild[gnat_2016?]
+	dev-ada/gprbuild[gnat_2017?]
+	dev-ada/gprbuild[gnat_2018?]"
 
 S="${WORKDIR}"/${MYP}-src