diff --git a/.php-cs-fixer.php b/.php-cs-fixer.php
index 2ec098c..534bd1d 100644
--- a/.php-cs-fixer.php
+++ b/.php-cs-fixer.php
@@ -65,7 +65,7 @@
         // PHP code must use the long `<?php` tags or short-echo `<?=` tags and not other tag variations.
         'full_opening_tag' => true,
         // Spaces should be properly placed in a function declaration.
-        'function_declaration' => ['closure_function_spacing'=>'none'],
+        'function_declaration' => ['closure_function_spacing'=>'none', 'closure_fn_spacing'=>'none'],
         // Replace core functions calls returning constants with the constants.
         'function_to_constant' => true,
         // Ensure single space between function's argument and its typehint.