diff --git a/cmd/promtool/tsdb.go b/cmd/promtool/tsdb.go
index 4e45c6662..85d8da112 100644
--- a/cmd/promtool/tsdb.go
+++ b/cmd/promtool/tsdb.go
@@ -359,7 +359,7 @@ func listBlocks(path string, humanReadable bool) error {
 }
 
 func printBlocks(blocks []tsdb.BlockReader, writeHeader, humanReadable bool) {
-	tw := tabwriter.NewWriter(os.Stdout, 0, 0, 2, ' ', 0)
+	tw := tabwriter.NewWriter(os.Stdout, 13, 0, 2, ' ', 0)
 	defer tw.Flush()
 
 	if writeHeader {