diff --git a/app/Console/Commands/AccountingInvoiceAdd.php b/app/Console/Commands/AccountingInvoiceAdd.php
index 417fe56..b7b64df 100644
--- a/app/Console/Commands/AccountingInvoiceAdd.php
+++ b/app/Console/Commands/AccountingInvoiceAdd.php
@@ -49,7 +49,7 @@ class AccountingInvoiceAdd extends Command
 
 		// Check the customer exists
 		if ($o->account->providers->where('pivot.provider_oauth_id',$so->id)->count() !== 1)
-			throw new \Exception('Account [%d] for Invoice [%d] not defined',$o->account_id,$o->id);
+			throw new \Exception(sprintf('Account [%d] for Invoice [%d] not defined',$o->account_id,$o->id));
 
 		$ao = $o->account->providers->where('pivot.provider_oauth_id',$so->id)->pop();