diff --git a/gtk/Gtk.metadata b/gtk/Gtk.metadata
index b84f265e3..b08924a3b 100644
--- a/gtk/Gtk.metadata
+++ b/gtk/Gtk.metadata
@@ -939,6 +939,7 @@
   <attr path="/api/namespace/struct[@cname='GtkWidgetAuxInfo']" name="hidden">1</attr>
   <attr path="/api/namespace/struct[@cname='GtkWidgetShapeInfo']" name="hidden">1</attr>
   <attr path="/api/namespace/struct[@cname='GtkWindowGeometryInfo']" name="hidden">1</attr>
+  <attr path="/api/namespace/object[@cname='GtkStyleContext']/method[@name='GetBackgroundColor']/*/parameter[@name='color']" name="pass_as">out</attr>
   <move-node path="/api/namespace/class[@cname='GtkBindings_']/method[@name='BindingsActivate']">/api/namespace/class[@cname='GtkGlobal']</move-node>
   <move-node path="/api/namespace/class[@cname='GtkGlobal']/method[@name='PaintArrow']">/api/namespace/object[@cname='GtkStyle']</move-node>
   <move-node path="/api/namespace/class[@cname='GtkGlobal']/method[@name='PaintBoxGap']">/api/namespace/object[@cname='GtkStyle']</move-node>