diff --git a/plugins/sudoers/sudo_nss.c b/plugins/sudoers/sudo_nss.c
index 26c5874f8..e42060005 100644
--- a/plugins/sudoers/sudo_nss.c
+++ b/plugins/sudoers/sudo_nss.c
@@ -137,7 +137,7 @@ sudo_read_nss(void)
 {
     FILE *fp;
     char *cp, *ep, *line = NULL;
-    ssize_t linesize = 0;
+    size_t linesize = 0;
 #ifdef HAVE_SSSD
     bool saw_sss = false;
 #endif