diff --git a/vendored_parsers/tree-sitter-perl/src/scanner.c b/vendored_parsers/tree-sitter-perl/src/scanner.c
index 6445b09d7..21d98263f 100644
--- a/vendored_parsers/tree-sitter-perl/src/scanner.c
+++ b/vendored_parsers/tree-sitter-perl/src/scanner.c
@@ -245,8 +245,6 @@ static void skip(TSLexer *lexer) {
   lexer->advance(lexer, true);
 }
 
-int iswspace(wint_t wc);
-
 // runs over spaces like a champ
 static void run_over_spaces(TSLexer *lexer) {
   while (iswspace(lexer->lookahead))