diff --git a/devel/libical/Portfile b/devel/libical/Portfile
index ec7a36b364a..26e14ab093a 100644
--- a/devel/libical/Portfile
+++ b/devel/libical/Portfile
@@ -29,6 +29,8 @@ depends_lib-append  path:lib/pkgconfig/glib-2.0.pc:glib2 \
                     path:lib/pkgconfig/gobject-introspection-1.0.pc:gobject-introspection \
                     path:lib/pkgconfig/icu-uc.pc:icu
 
+license_noconflict  vala
+
 configure.args      -DGOBJECT_INTROSPECTION=ON \
                     -DICAL_GLIB_VAPI=ON \
                     -DICAL_BUILD_DOCS=OFF