diff --git a/src/lib/evloop/timers.h b/src/lib/evloop/timers.h
index 7595554204..f317d0ad0e 100644
--- a/src/lib/evloop/timers.h
+++ b/src/lib/evloop/timers.h
@@ -13,6 +13,7 @@
 #include "lib/testsupport/testsupport.h"
 
 struct monotime_t;
+struct timeval;
 typedef struct timeout tor_timer_t;
 typedef void (*timer_cb_fn_t)(tor_timer_t *, void *,
                               const struct monotime_t *);