diff --git a/src/core/etl/src/Flow/ETL/PHP/Type/Logical/StructureType.php b/src/core/etl/src/Flow/ETL/PHP/Type/Logical/StructureType.php
index 452a3cb70..46943217b 100644
--- a/src/core/etl/src/Flow/ETL/PHP/Type/Logical/StructureType.php
+++ b/src/core/etl/src/Flow/ETL/PHP/Type/Logical/StructureType.php
@@ -86,6 +86,6 @@ public function toString() : string
             $content[] = $element->toString();
         }
 
-        return  ($this->nullable ? '?' : '') . 'structure{' . \implode(', ', $content) . '}';
+        return ($this->nullable ? '?' : '') . 'structure{' . \implode(', ', $content) . '}';
     }
 }