diff --git a/x11-clocks/xfce4-datetime-plugin/Makefile b/x11-clocks/xfce4-datetime-plugin/Makefile
index bff05a6ce97f..efe7f7b56fed 100644
--- a/x11-clocks/xfce4-datetime-plugin/Makefile
+++ b/x11-clocks/xfce4-datetime-plugin/Makefile
@@ -12,7 +12,8 @@ COMMENT=	Datetime panel plugin for the Xfce desktop
 
 LICENSE=	GPLv2
 
-USES=		gettext-tools gmake gnome libtool pkgconfig tar:bzip2 xfce
+USES=		compiler:c11 gettext-tools gmake gnome libtool pkgconfig \
+		tar:bzip2 xfce
 USE_GNOME=	cairo gtk30 intltool
 USE_XFCE=	panel