1 files changed, 1 insertions, 1 deletions
diff --git a/iothread.c b/iothread.c
index 589bcd3..8810376 100644
--- a/iothread.c
+++ b/iothread.c
@@ -292,7 +292,7 @@ static void iothread_set_poll_param(Object *obj, Visitor *v,
     }
 }
 
-static void iothread_class_init(ObjectClass *klass, void *class_data)
+static void iothread_class_init(ObjectClass *klass, const void *class_data)
 {
     EventLoopBaseClass *bc = EVENT_LOOP_BASE_CLASS(klass);