diff --git a/gtk/gtkapplication.c b/gtk/gtkapplication.c
index 2b87b9c45a..fd11c96445 100644
--- a/gtk/gtkapplication.c
+++ b/gtk/gtkapplication.c
@@ -754,7 +754,7 @@ gtk_application_class_init (GtkApplicationClass *class)
 
 /**
  * gtk_application_new:
- * @application_id (allow-none): The application ID.
+ * @application_id: (allow-none): The application ID.
  * @flags: the application flags
  *
  * Creates a new #GtkApplication instance.