diff --git a/usr.bin/lock/lock.c b/usr.bin/lock/lock.c
index c1ffcb53233..be3e63fc423 100644
--- a/usr.bin/lock/lock.c
+++ b/usr.bin/lock/lock.c
@@ -59,7 +59,6 @@ static const char rcsid[] =
 #include <sys/param.h>
 #include <sys/stat.h>
 #include <sys/time.h>
-#include <sys/types.h>
 #include <sys/signal.h>
 #include <err.h>
 #include <ctype.h>