diff --git a/sus.c b/sus.c
index 35eff58..2c958d2 100644
--- a/sus.c
+++ b/sus.c
@@ -19,7 +19,7 @@ read_ids()
 {
 	FILE *f = fopen("/etc/sus", "r");
 	if (!f) return 0;
-	while (!feof(f))
+	while (!feof(f) && ids_len < 99)
 		fscanf(f, "%lld", &ids[ids_len++]);
 	if (ids_len == 0) return 0;
 	return 1;