diff --git a/gtk/gtkfilechoosernativewin32.c b/gtk/gtkfilechoosernativewin32.c
index 68076989fc..7bb3e54b36 100644
--- a/gtk/gtkfilechoosernativewin32.c
+++ b/gtk/gtkfilechoosernativewin32.c
@@ -906,6 +906,7 @@ gtk_file_chooser_native_win32_show (GtkFileChooserNative *self)
               filechooser_win32_thread_data_free (data);
               return FALSE;
             }
+          g_object_unref (filter);
         }
       self->current_filter = gtk_file_chooser_get_filter (GTK_FILE_CHOOSER (self));
     }