diff --git a/Source/Libs/GtkSharp/GtkSharp.metadata b/Source/Libs/GtkSharp/GtkSharp.metadata
index b6f93a5f8..be4678d67 100644
--- a/Source/Libs/GtkSharp/GtkSharp.metadata
+++ b/Source/Libs/GtkSharp/GtkSharp.metadata
@@ -647,6 +647,7 @@
   <attr path="/api/namespace/object[@cname='GtkStyleContext']/method[@name='GetColor']/*/parameter[@name='color']" name="pass_as">out</attr>
   <attr path="/api/namespace/object[@cname='GtkStyleContext']/method[@name='GetMargin']/*/parameter[@name='margin']" name="pass_as">out</attr>
   <attr path="/api/namespace/object[@cname='GtkStyleContext']/method[@name='GetPadding']/*/parameter[@name='padding']" name="pass_as">out</attr>
+  <attr path="/api/namespace/object[@cname='GtkStyleContext']/method[@name='GetProperty']/*/parameter[@name='value']" name="pass_as">out</attr>
   <attr path="/api/namespace/object[@cname='GtkStyleContext']/method[@name='GetStyle']" name="hidden">1</attr>
   <attr path="/api/namespace/object[@cname='GtkStyleContext']/method[@name='GetStyleProperty']/*/parameter[@name='value']" name="pass_as">out</attr>
   <attr path="/api/namespace/object[@cname='GtkStyleContext']/method[@name='GetStyleValist']" name="hidden">1</attr>