diff --git a/package.xml b/package.xml
index 8a84f7e700..57d98a105b 100644
--- a/package.xml
+++ b/package.xml
@@ -27,6 +27,7 @@ http://pear.php.net/dtd/package-2.0.xsd">
  <license uri="https://github.com/squizlabs/PHP_CodeSniffer/blob/master/licence.txt">BSD 3-Clause License</license>
  <notes>
   - The PHP 7.4 numeric separator backfill now works correctly for more float formats
+  - The PHP 7.4 numeric separator backfill is no longer run on PHP versions 7.4.0 or greater
   - Fixed bug #2688 : Case statements not tokenized correctly when switch is contained within ternary
   - Fixed bug #2698 : PHPCS throws errors determining auto report width when shell_exec is disabled
     -- Thanks to Matthew Peveler for the patch
diff --git a/src/Tokenizers/PHP.php b/src/Tokenizers/PHP.php
index c395b1be73..6a6a30fce2 100644
--- a/src/Tokenizers/PHP.php
+++ b/src/Tokenizers/PHP.php
@@ -974,13 +974,14 @@ protected function tokenize($string)
                 and change these tokens in earlier versions.
             */
 
-            if ($tokenIsArray === true
+            if (PHP_VERSION_ID < 70400
+                && ($tokenIsArray === true
                 && ($token[0] === T_LNUMBER
                 || $token[0] === T_DNUMBER)
                 && isset($tokens[($stackPtr + 1)]) === true
                 && is_array($tokens[($stackPtr + 1)]) === true
                 && $tokens[($stackPtr + 1)][0] === T_STRING
-                && $tokens[($stackPtr + 1)][1][0] === '_'
+                && $tokens[($stackPtr + 1)][1][0] === '_')
             ) {
                 $newContent = $token[1];
                 $newType    = $token[0];