diff --git a/templates/_form.tpl b/templates/_form.tpl
index 1330a4e..3e6029d 100644
--- a/templates/_form.tpl
+++ b/templates/_form.tpl
@@ -28,7 +28,7 @@
 		<legend data-types="t3">Créer un reçu de cotisation</legend>
 		<dl>
 
-			{input type="text" name="numero_facture" maxlength=12 label="Numéro du document" required=$require_number source=$doc}
+			{input type="text" name="numero_facture" maxlength=18 label="Numéro du document" required=$require_number source=$doc}
 
 			<dd class="help">
 				{if $require_number}