diff --git a/libblkid/src/partitions/atari.c b/libblkid/src/partitions/atari.c
index f8b6fb5b5..f9404f9e1 100644
--- a/libblkid/src/partitions/atari.c
+++ b/libblkid/src/partitions/atari.c
@@ -199,11 +199,10 @@ static int probe_atari_pt(blkid_probe pr,
 
 	hdsize = blkid_probe_get_size(pr) / 512;
 
-	/* Look for validly looking primary partition */
-	for (i = 0; ; i++) {
-		if (i >= ARRAY_SIZE(rs->part))
-			goto nothing;
-
+	/*
+	 * At least one valid partition required
+	 */
+	for (i = 0; i < 4; i++) {
 		if (IS_PARTDEF_VALID(rs->part[i], hdsize)) {
 			if (blkid_probe_set_magic(pr,
 					offsetof(struct atari_rootsector, part[i]),
@@ -214,6 +213,9 @@ static int probe_atari_pt(blkid_probe pr,
 		}
 	}
 
+	if (i == 4)
+		goto nothing;
+
 	if (blkid_partitions_need_typeonly(pr))
 		/* caller does not ask for details about partitions */
 		return BLKID_PROBE_OK;