diff --git a/htdocs/core/class/commoninvoice.class.php b/htdocs/core/class/commoninvoice.class.php
index 430c477e89a35..abc8f7e2a4995 100644
--- a/htdocs/core/class/commoninvoice.class.php
+++ b/htdocs/core/class/commoninvoice.class.php
@@ -1690,6 +1690,7 @@ public function buildEPCQrCodeString()
 
 		// Add the amount and reference
 		$lines[] = 'EUR' . $totalTTCString; // Amount (optional)
+		$lines[] = ''; // Purpose (optional)
 		$lines[] = ''; // Payment reference (optional)
 		$lines[] = $this->ref; // Remittance Information (optional)