diff --git a/src/Tokenizer/Transformer/BraceTransformer.php b/src/Tokenizer/Transformer/BraceTransformer.php
index 269e208178d..01c018f0b5f 100644
--- a/src/Tokenizer/Transformer/BraceTransformer.php
+++ b/src/Tokenizer/Transformer/BraceTransformer.php
@@ -195,8 +195,9 @@ private function transformIntoPropertyHookBraces(Tokens $tokens, int $index): vo
 
     private function transformIntoCurlyIndexBraces(Tokens $tokens, int $index): void
     {
-        // as $arr{index} is illegal since 8.0
-        if (\PHP_VERSION_ID >= 8_00_00) {
+        // as $arr{index} is illegal since 8.4 - ParseError
+        // (and produces FatalError on 8.0-8.3)
+        if (\PHP_VERSION_ID >= 8_04_00) {
             return;
         }