diff --git a/.php-cs-fixer.php b/.php-cs-fixer.php
index 650f766b..0754b09e 100644
--- a/.php-cs-fixer.php
+++ b/.php-cs-fixer.php
@@ -6,70 +6,77 @@ declare(strict_types=1);
  * @since 2.7.0
  */
 
+$rules = [
+    '@PSR12' => true,
+    '@Symfony' => true,
+    '@PhpCsFixer' => true,
+    'array_syntax' => [
+        'syntax' => 'short',
+    ],
+    'list_syntax' => [
+        'syntax' => 'short',
+    ],
+    'concat_space' => [
+        'spacing' => 'one',
+    ],
+    'blank_line_before_statement' => [
+        'statements' => [
+            'declare',
+        ],
+    ],
+    'ordered_imports' => [
+        'imports_order' => [
+            'class',
+            'function',
+            'const',
+        ],
+        'sort_algorithm' => 'alpha',
+    ],
+    'single_line_comment_style' => [
+        'comment_types' => [
+        ],
+    ],
+    'yoda_style' => [
+        'always_move_variable' => false,
+        'equal' => false,
+        'identical' => false,
+    ],
+    'multiline_whitespace_before_semicolons' => [
+        'strategy' => 'no_multi_line',
+    ],
+    'constant_case' => [
+        'case' => 'lower',
+    ],
+    'class_attributes_separation' => true,
+    'combine_consecutive_unsets' => true,
+    'declare_strict_types' => true,
+    'linebreak_after_opening_tag' => true,
+    'lowercase_static_reference' => true,
+    'no_useless_else' => true,
+    'no_unused_imports' => true,
+    'not_operator_with_successor_space' => false,
+    'not_operator_with_space' => false,
+    'ordered_class_elements' => true,
+    'php_unit_strict' => false,
+    'phpdoc_separation' => false,
+    'single_quote' => true,
+    'standardize_not_equals' => true,
+    'multiline_comment_opening_closing' => true,
+    'phpdoc_summary' => false,
+    'php_unit_test_class_requires_covers' => false,
+    'global_namespace_import' => false,
+    'phpdoc_order' => false,
+];
+
+if (PHP_VERSION_ID > 70400) {
+    $rules['no_useless_concat_operator'] = false;
+}
+
+// 'no_useless_concat_operator' => false,
+
 return (new PhpCsFixer\Config())
     ->setRiskyAllowed(true)
-    ->setRules([
-        '@PSR12' => true,
-        '@Symfony' => true,
-        '@PhpCsFixer' => true,
-        'array_syntax' => [
-            'syntax' => 'short',
-        ],
-        'list_syntax' => [
-            'syntax' => 'short',
-        ],
-        'concat_space' => [
-            'spacing' => 'one',
-        ],
-        'blank_line_before_statement' => [
-            'statements' => [
-                'declare',
-            ],
-        ],
-        'ordered_imports' => [
-            'imports_order' => [
-                'class',
-                'function',
-                'const',
-            ],
-            'sort_algorithm' => 'alpha',
-        ],
-        'single_line_comment_style' => [
-            'comment_types' => [
-            ],
-        ],
-        'yoda_style' => [
-            'always_move_variable' => false,
-            'equal' => false,
-            'identical' => false,
-        ],
-        'multiline_whitespace_before_semicolons' => [
-            'strategy' => 'no_multi_line',
-        ],
-        'constant_case' => [
-            'case' => 'lower',
-        ],
-        'class_attributes_separation' => true,
-        'combine_consecutive_unsets' => true,
-        'declare_strict_types' => true,
-        'linebreak_after_opening_tag' => true,
-        'lowercase_static_reference' => true,
-        'no_useless_else' => true,
-        'no_unused_imports' => true,
-        'not_operator_with_successor_space' => false,
-        'not_operator_with_space' => false,
-        'ordered_class_elements' => true,
-        'php_unit_strict' => false,
-        'phpdoc_separation' => false,
-        'single_quote' => true,
-        'standardize_not_equals' => true,
-        'multiline_comment_opening_closing' => true,
-        'phpdoc_summary' => false,
-        'php_unit_test_class_requires_covers' => false,
-        'global_namespace_import' => false,
-        'phpdoc_order' => false,
-        'no_useless_concat_operator' => false,
-    ])
+    ->setRules($rules)
     ->setFinder(
         PhpCsFixer\Finder::create()
             ->in(__DIR__ . '/src')