diff --git a/include/sudo_event.h b/include/sudo_event.h
index d74c90c09..70983a062 100644
--- a/include/sudo_event.h
+++ b/include/sudo_event.h
@@ -23,6 +23,8 @@
 #include <signal.h>	/* for sigatomic_t and NSIG */
 #include "sudo_queue.h"
 
+struct timeval;		/* for deprecated APIs */
+
 /* Event types (keep in sync with sudo_plugin.h) */
 #define SUDO_EV_TIMEOUT		0x01	/* fire after timeout */
 #define SUDO_EV_READ		0x02	/* fire when readable */