diff --git a/.php_cs.php b/.php_cs.php
index 697e4a76..d901d690 100644
--- a/.php_cs.php
+++ b/.php_cs.php
@@ -16,6 +16,7 @@
         'phpdoc_trim_consecutive_blank_line_separation' => true,
         'phpdoc_types_order' => true,
         'yoda_style' => false,
+        'concat_space' => ['spacing' => 'one'],
     ])
     ->setFinder(
         PhpCsFixer\Finder::create()