diff --git a/src/Entity/JOExtra.php b/src/Entity/JOExtra.php
index 4784c629..b93b1e25 100644
--- a/src/Entity/JOExtra.php
+++ b/src/Entity/JOExtra.php
@@ -189,7 +189,7 @@ class JOExtra
 
     public function setCustomerSignature($sig_file)
     {
-        $this->cust_signature($sig_file);
+        $this->cust_signature = $sig_file;
         return $this;
     }