diff --git a/src/plugins/controls/label/plugin.c b/src/plugins/controls/label/plugin.c
index 958768ff..7babb9e0 100644
--- a/src/plugins/controls/label/plugin.c
+++ b/src/plugins/controls/label/plugin.c
@@ -64,6 +64,8 @@ struct _ply_label_plugin_control
   uint32_t is_hidden : 1;
 };
 
+ply_label_plugin_interface_t * ply_label_plugin_get_interface (void);
+
 static ply_label_plugin_control_t *
 create_control (void)
 {