diff --git a/event-internal.h b/event-internal.h
index 12ca8bc1..74c2a396 100644
--- a/event-internal.h
+++ b/event-internal.h
@@ -313,10 +313,12 @@ struct event_config {
 #define	TAILQ_NEXT(elm, field)		((elm)->field.tqe_next)
 #endif
 
+#ifndef TAILQ_FOREACH
 #define TAILQ_FOREACH(var, head, field)					\
 	for ((var) = TAILQ_FIRST(head);					\
 	     (var) != TAILQ_END(head);					\
 	     (var) = TAILQ_NEXT(var, field))
+#endif
 
 #ifndef TAILQ_INSERT_BEFORE
 #define	TAILQ_INSERT_BEFORE(listelm, elm, field) do {			\