diff --git a/compact.go b/compact.go
index a1a7aa76f..bf07d25e8 100644
--- a/compact.go
+++ b/compact.go
@@ -309,7 +309,7 @@ func splitByRange(ds []dirMeta, tr int64) [][]dirMeta {
 		}
 		// Skip blocks that don't fall into the range. This can happen via mis-alignment or
 		// by being the multiple of the intended range.
-		if ds[i].meta.MinTime < t0 || ds[i].meta.MaxTime > t0+tr {
+		if m.MaxTime > t0+tr {
 			i++
 			continue
 		}
@@ -317,7 +317,7 @@ func splitByRange(ds []dirMeta, tr int64) [][]dirMeta {
 		// Add all dirs to the current group that are within [t0, t0+tr].
 		for ; i < len(ds); i++ {
 			// Either the block falls into the next range or doesn't fit at all (checked above).
-			if ds[i].meta.MinTime < t0 || ds[i].meta.MaxTime > t0+tr {
+			if ds[i].meta.MaxTime > t0+tr {
 				break
 			}
 			group = append(group, ds[i])
diff --git a/db.go b/db.go
index 0022df12d..275d96eb7 100644
--- a/db.go
+++ b/db.go
@@ -896,7 +896,7 @@ func (db *DB) Snapshot(dir string, withHead bool) error {
 	if dir == db.dir {
 		return errors.Errorf("cannot snapshot into base directory")
 	}
-	if _, err := ulid.Parse(dir); err == nil {
+	if _, err := ulid.ParseStrict(dir); err == nil {
 		return errors.Errorf("dir must not be a valid ULID")
 	}
 
@@ -1037,7 +1037,7 @@ func isBlockDir(fi os.FileInfo) bool {
 	if !fi.IsDir() {
 		return false
 	}
-	_, err := ulid.Parse(fi.Name())
+	_, err := ulid.ParseStrict(fi.Name())
 	return err == nil
 }