diff --git a/src/matrix-api.h b/src/matrix-api.h
index 2c170fa..deb84ca 100644
--- a/src/matrix-api.h
+++ b/src/matrix-api.h
@@ -160,6 +160,7 @@ struct _MatrixAPIInterface {
     void *padding[20];
 };
 
+GType matrix_api_get_type(void) G_GNUC_CONST;
 void matrix_api_initial_sync(MatrixAPI *api,
                              MatrixAPICallback callback,
                              gpointer user_data,