diff --git a/lib/libc/stdlib/getopt.3 b/lib/libc/stdlib/getopt.3
index bdbed8d0784f..88fb51f38fec 100644
--- a/lib/libc/stdlib/getopt.3
+++ b/lib/libc/stdlib/getopt.3
@@ -164,8 +164,7 @@ The
 function returns \-1 when the argument list is exhausted.
 .Sh EXAMPLES
 .Bd -literal -compact
-extern char *optarg;
-extern int optind;
+#include <unistd.h>
 int bflag, ch, fd;
 
 bflag = 0;