diff --git a/src/passwd/putgrent.c b/src/passwd/putgrent.c
index a0b320fc32692bc244d40f0c0191f8d94eefb388..2a8257dc9c2dfb0e8a41c4cd98a698a6cc42aad5 100644
--- a/src/passwd/putgrent.c
+++ b/src/passwd/putgrent.c
@@ -7,7 +7,7 @@ int putgrent(const struct group *gr, FILE *f)
 	int r;
 	size_t i;
 	flockfile(f);
-	if ((r = fprintf(f, "%s:%s:%d:", gr->gr_name, gr->gr_passwd, gr->gr_gid))<0) goto done;
+	if ((r = fprintf(f, "%s:%s:%u:", gr->gr_name, gr->gr_passwd, gr->gr_gid))<0) goto done;
 	if (gr->gr_mem) for (i=0; gr->gr_mem[i]; i++)
 		if ((r = fprintf(f, "%s%s", i?",":"", gr->gr_mem[i]))<0) goto done;
 	r = fputc('\n', f);
diff --git a/src/passwd/putpwent.c b/src/passwd/putpwent.c
index 3a02e5730482044d56e1458b26360fefa3f85541..312b76530254d14b246ca1fc5972096c3f53ba65 100644
--- a/src/passwd/putpwent.c
+++ b/src/passwd/putpwent.c
@@ -4,7 +4,7 @@
 
 int putpwent(const struct passwd *pw, FILE *f)
 {
-	return fprintf(f, "%s:%s:%d:%d:%s:%s:%s\n",
+	return fprintf(f, "%s:%s:%u:%u:%s:%s:%s\n",
 		pw->pw_name, pw->pw_passwd, pw->pw_uid, pw->pw_gid,
 		pw->pw_gecos, pw->pw_dir, pw->pw_shell)<0 ? -1 : 0;
 }