diff --git a/gfx/src/gtk/nsDeviceContextGTK.cpp b/gfx/src/gtk/nsDeviceContextGTK.cpp
index 29b1bfc3fc9..9191b13db79 100644
--- a/gfx/src/gtk/nsDeviceContextGTK.cpp
+++ b/gfx/src/gtk/nsDeviceContextGTK.cpp
@@ -1224,5 +1224,6 @@ xlfd_from_pango_font_description(GtkWidget *aWidget,
     g_free(subfont_charsets);
   }
   g_free(spec);
+  g_object_unref(font);
 }
 #endif /* MOZ_WIDGET_GTK2 && MOZ_ENABLE_COREXFONTS */