2 files changed, 9 insertions, 6 deletions
diff --git a/backends/null/null.c b/backends/null/null.c
index c049dcb..b96c9b0 100644
--- a/backends/null/null.c
+++ b/backends/null/null.c
@@ -28,7 +28,6 @@
 
 /* Support function for dynamic loading of the backend module */
 void  backend_module_init (GTypeModule *module);
-void  backend_module_free (void);
 
 const MateMixerBackendModuleInfo *backend_module_get_info (void);
 
@@ -52,11 +51,6 @@ backend_module_init (GTypeModule *module)
     info.backend_type = MATE_MIXER_BACKEND_TYPE_NULL;
 }
 
-void
-backend_module_free (void)
-{
-}
-
 const MateMixerBackendModuleInfo *
 backend_module_get_info (void)
 {
@@ -66,6 +60,7 @@ backend_module_get_info (void)
 static void
 mate_mixer_backend_interface_init (MateMixerBackendInterface *iface)
 {
+    iface->open = mate_mixer_null_open;
 }
 
 static void
@@ -93,3 +88,9 @@ static void
 mate_mixer_null_class_finalize (MateMixerNullClass *klass)
 {
 }
+
+gboolean
+mate_mixer_null_open (MateMixerBackend *backend)
+{
+    return TRUE;
+}
diff --git a/backends/null/null.h b/backends/null/null.h
index ef5b779..d73794e 100644
--- a/backends/null/null.h
+++ b/backends/null/null.h
@@ -51,4 +51,6 @@ struct _MateMixerNullClass
 
 GType mate_mixer_null_get_type (void) G_GNUC_CONST;
 
+gboolean mate_mixer_null_open (MateMixerBackend *backend);
+
 #endif /* MATEMIXER_NULL_H */