diff --git a/lib/pure/unicode.nim b/lib/pure/unicode.nim
index 35c364221..33b720f62 100644
--- a/lib/pure/unicode.nim
+++ b/lib/pure/unicode.nim
@@ -388,7 +388,7 @@ proc runeStrAtPos*(s: string, pos: Natural): string =
   ## * `runeAtPos proc <#runeAtPos,string,int>`_
   ## * `fastRuneAt template <#fastRuneAt.t,string,int,untyped>`_
   let o = runeOffset(s, pos)
-  s[o.. (o+runeLenAt(s, o)-1)]
+  s[o .. (o+runeLenAt(s, o)-1)]
 
 proc runeSubStr*(s: string, pos: int, len: int = int.high): string =
   ## Returns the UTF-8 substring starting at code point ``pos``