diff --git a/sci-mathematics/rkward/rkward-9999.ebuild b/sci-mathematics/rkward/rkward-9999.ebuild
index d0da70823a..9d94d5a805 100644
--- a/sci-mathematics/rkward/rkward-9999.ebuild
+++ b/sci-mathematics/rkward/rkward-9999.ebuild
@@ -22,6 +22,7 @@ IUSE=""
 
 DEPEND="
 	dev-lang/R
+	dev-libs/kdsingleapplication[qt6(+)]
 	>=dev-qt/qt5compat-${QTMIN}:6
 	>=dev-qt/qtbase-${QTMIN}:6[dbus,gui,network,widgets,xml]
 	>=dev-qt/qtdeclarative-${QTMIN}:6