diff --git a/third_party/libevent/README.chromium b/third_party/libevent/README.chromium
index 0f0535760d..b855319ccf 100644
--- a/third_party/libevent/README.chromium
+++ b/third_party/libevent/README.chromium
@@ -31,3 +31,4 @@ static library using GYP.
 6) Remove an unnecessary workaround for OS X 10.4 from kqueue.c. It was causing
    problems on macOS Sierra.
 7) Change buffer.c to not redefine _GNU_SOURCE.
+8) Change _event_strlcpy in strlcpy.c to not use K&R syntax.
diff --git a/third_party/libevent/strlcpy.c b/third_party/libevent/strlcpy.c
index 5d194527c8..149fee5d99 100644
--- a/third_party/libevent/strlcpy.c
+++ b/third_party/libevent/strlcpy.c
@@ -46,10 +46,7 @@ static char *rcsid = "$OpenBSD: strlcpy.c,v 1.5 2001/05/13 15:40:16 deraadt Exp
  * Returns strlen(src); if retval >= siz, truncation occurred.
  */
 size_t
-_event_strlcpy(dst, src, siz)
-	char *dst;
-	const char *src;
-	size_t siz;
+_event_strlcpy(char *dst, const char *src, size_t siz)
 {
 	register char *d = dst;
 	register const char *s = src;