diff --git a/sys/kern/kern_event.c b/sys/kern/kern_event.c
index 604f7e42de29..c8d9c9611f11 100644
--- a/sys/kern/kern_event.c
+++ b/sys/kern/kern_event.c
@@ -225,6 +225,8 @@ static unsigned int 	kq_calloutmax = 4 * 1024;
 SYSCTL_UINT(_kern, OID_AUTO, kq_calloutmax, CTLFLAG_RW,
     &kq_calloutmax, 0, "Maximum number of callouts allocated for kqueue");
 
+#define KQ_DEBUG
+
 #define KQ_LOCK(kq) do {						\
 	mtx_lock(&(kq)->kq_lock);					\
 } while (0)