diff --git a/laymanshex.go b/laymanshex.go
index dd7b988..23b12ab 100644
--- a/laymanshex.go
+++ b/laymanshex.go
@@ -439,7 +439,7 @@ func fmtPadding(descr fileDescription, nopadding bool) (string, string, string)
 	}
 	pad := 0
 	for _, part := range descr.parts {
-		if n := len(part.name); n > pad {
+		if n := len([]rune(part.name)); n > pad {
 			pad = n
 		}
 	}