diff --git a/sys-cluster/TCL/TCL-1.0.ebuild b/sys-cluster/TCL/TCL-1.0.ebuild
index b4eb7020d0..de2080aff9 100644
--- a/sys-cluster/TCL/TCL-1.0.ebuild
+++ b/sys-cluster/TCL/TCL-1.0.ebuild
@@ -31,7 +31,7 @@ DEPEND="${RDEPEND}"
 
 REQUIRED_USE="
 	|| ( fti scr veloc )
-	|| ( ${IUSE_TCL//+/} )
+	?? ( ${IUSE_TCL//+/} )
 "
 
 src_prepare() {