diff --git a/PHPCSUtils/AbstractSniffs/AbstractArrayDeclarationSniff.php b/PHPCSUtils/AbstractSniffs/AbstractArrayDeclarationSniff.php
index 1480d25e..2e08b4da 100644
--- a/PHPCSUtils/AbstractSniffs/AbstractArrayDeclarationSniff.php
+++ b/PHPCSUtils/AbstractSniffs/AbstractArrayDeclarationSniff.php
@@ -478,31 +478,15 @@ public function getActualArrayKey(File $phpcsFile, $startPtr, $endPtr)
                 continue;
             }
 
-            // Handle FQN true/false/null.
-            if ($this->tokens[$i]['code'] === \T_NAME_FULLY_QUALIFIED) {
-                $compareReadyKeyword = \strtolower($this->tokens[$i]['content']);
-                if ($compareReadyKeyword === '\true'
-                    || $compareReadyKeyword === '\false'
-                    || $compareReadyKeyword === '\null'
-                ) {
-                    // FQN true/false/null on PHPCS 4.x. This can be handled.
-                    $content .= $this->tokens[$i]['content'];
-                    continue;
-                }
-            } elseif ($this->tokens[$i]['code'] === \T_NS_SEPARATOR) {
-                // PHPCS 3.x.
+            // Handle FQN true/false/null for PHPCS 3.x.
+            if ($this->tokens[$i]['code'] === \T_NS_SEPARATOR) {
                 $nextNonEmpty   = $phpcsFile->findNext(Tokens::$emptyTokens, ($i + 1), null, true);
                 $nextNonEmptyLC = \strtolower($this->tokens[$nextNonEmpty]['content']);
                 if ($nextNonEmpty !== false
-                    // PHPCS 3.x with PHP < 8.0.
                     && ($this->tokens[$nextNonEmpty]['code'] === \T_TRUE
                     || $this->tokens[$nextNonEmpty]['code'] === \T_FALSE
-                    || $this->tokens[$nextNonEmpty]['code'] === \T_NULL
-                    // PHPCS 3.x with PHP >= 8.0 where the namespaced name tokenization has been undone.
-                    || ($this->tokens[$nextNonEmpty]['code'] === \T_STRING
-                        && ($nextNonEmptyLC === 'true' || $nextNonEmptyLC === 'false' || $nextNonEmptyLC === 'null')))
+                    || $this->tokens[$nextNonEmpty]['code'] === \T_NULL)
                 ) {
-                    // FQN true/false/null on PHPCS 3.x. This can be handled.
                     $content .= $this->tokens[$nextNonEmpty]['content'];
                     $i        = $nextNonEmpty;
                     continue;