diff --git a/internal/php8/lexer.go b/internal/php8/lexer.go
index 45ba443..12d2a34 100644
--- a/internal/php8/lexer.go
+++ b/internal/php8/lexer.go
@@ -112,42 +112,6 @@ func (lex *Lexer) isNotStringEnd(s byte) bool {
 }
 
 func (lex *Lexer) isHeredocEnd(p int) bool {
-	o, err := version.New("7.3")
-	if err != nil {
-		panic(err)
-	}
-
-	if lex.phpVersion.GreaterOrEqual(o) {
-		return lex.isHeredocEndSince73(p)
-	}
-
-	return lex.isHeredocEndBefore73(p)
-}
-
-func (lex *Lexer) isHeredocEndBefore73(p int) bool {
-	if lex.data[p-1] != '\r' && lex.data[p-1] != '\n' {
-		return false
-	}
-
-	l := len(lex.heredocLabel)
-	if len(lex.data) < p+l {
-		return false
-	}
-
-	if len(lex.data) > p+l && lex.data[p+l] != ';' && lex.data[p+l] != '\r' &&
-		lex.data[p+l] != '\n' {
-		return false
-	}
-
-	if len(lex.data) > p+l+1 && lex.data[p+l] == ';' && lex.data[p+l+1] != '\r' &&
-		lex.data[p+l+1] != '\n' {
-		return false
-	}
-
-	return bytes.Equal(lex.heredocLabel, lex.data[p:p+l])
-}
-
-func (lex *Lexer) isHeredocEndSince73(p int) bool {
 	if lex.data[p-1] != '\r' && lex.data[p-1] != '\n' {
 		return false
 	}