diff --git a/src/PhpCsFixerCodingStandard.php b/src/PhpCsFixerCodingStandard.php
index d2d2af5..0280a45 100644
--- a/src/PhpCsFixerCodingStandard.php
+++ b/src/PhpCsFixerCodingStandard.php
@@ -57,6 +57,7 @@ public function applyTo(ConfigInterface $config, array $overridingRules = []): v
                 'no_superfluous_phpdoc_tags' => ['remove_inheritdoc' => true],
                 'no_trailing_whitespace_in_string' => false,
                 'nullable_type_declaration_for_default_null_value' => true,
+                'numeric_literal_separator' => ['strategy' => 'use_separator', 'override_existing' => true],
                 'ordered_class_elements' => ['order' => ['use_trait']],
                 'ordered_imports' => ['imports_order' => ['class', 'function', 'const']],
                 'ordered_types' => ['sort_algorithm' => 'none'],