---
 pwdx.c |    1 +
 1 file changed, 1 insertion(+)

--- pwdx.c
+++ pwdx.c	2016-07-11 13:17:16.154313659 +0000
@@ -109,6 +109,7 @@ int main(int argc, char *argv[])
 		buflen = 10 + strlen(argv[i]) + 1;
 		buf = xmalloc(buflen);
 
+		errno = 0;
 		if (check_pid_argument(argv[i]))
 			xerrx(EXIT_FAILURE, _("invalid process id: %s"),
 			     argv[i]);