diff --git a/src/SIE/Data/Verification.php b/src/SIE/Data/Verification.php
index 3aaf336..41dcc6b 100644
--- a/src/SIE/Data/Verification.php
+++ b/src/SIE/Data/Verification.php
@@ -138,7 +138,7 @@ public function validate(): void
         }
 
         if ($this->transactions === []) {
-            throw new DomainException(  'No transactions for verification id "' . $this->id . '".' );
+            throw new DomainException('No transactions for verification id "' . $this->id . '".');
         }
 
         // validate verifications