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-rw-r--r--thread_pthread_mn.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/thread_pthread_mn.c b/thread_pthread_mn.c
index 503815fa1c..d26ddd449a 100644
--- a/thread_pthread_mn.c
+++ b/thread_pthread_mn.c
@@ -774,7 +774,7 @@ timer_thread_register_waiting(rb_thread_t *th, int fd, enum thread_sched_waiting
ccan_list_add_tail(&timer_th.waiting, &th->sched.waiting_reason.node);
}
else {
- RUBY_DEBUG_LOG("abs:%lu", abs);
+ RUBY_DEBUG_LOG("abs:%lu", (unsigned long)abs);
VM_ASSERT(flags & thread_sched_waiting_timeout);
// insert th to sorted list (TODO: O(n))