diff --git a/src/th_kqueue_service.c b/src/th_kqueue_service.c
index da35e4b..36e85dc 100644
--- a/src/th_kqueue_service.c
+++ b/src/th_kqueue_service.c
@@ -168,6 +168,7 @@ th_kqueue_service_init(th_kqueue_service* service, th_runner* runner, th_allocat
     service->base.destroy = th_kqueue_service_destroy;
     service->allocator = allocator;
     service->runner = runner;
+    service->timer_list = (th_kqueue_timer_list){0};
     if ((service->kq = kqueue()) == -1) {
         return TH_ERR_SYSTEM(errno);
     }
diff --git a/th.c b/th.c
index 3bf5a9b..77ecd1a 100644
--- a/th.c
+++ b/th.c
@@ -5777,6 +5777,7 @@ th_kqueue_service_init(th_kqueue_service* service, th_runner* runner, th_allocat
     service->base.destroy = th_kqueue_service_destroy;
     service->allocator = allocator;
     service->runner = runner;
+    service->timer_list = (th_kqueue_timer_list){0};
     if ((service->kq = kqueue()) == -1) {
         return TH_ERR_SYSTEM(errno);
     }