diff --git a/src_v2/parser/parser_internals.nim b/src_v2/parser/parser_internals.nim
index d127c9b..580c2b1 100644
--- a/src_v2/parser/parser_internals.nim
+++ b/src_v2/parser/parser_internals.nim
@@ -106,7 +106,7 @@ proc str*(expectedString: string): parserFnT {.inline.} =
   ## Creates parser function with `expectedString`
   ## When the parser has the string at the following index return `ParserResult.ok`
   return proc(parser: Parser): ParserResult =
-    var res = parser.ok()
+    var res: ParserResult = parser.ok()
     for c in expectedString.items:
       res = res.flatMap(ch(c))
     return res