diff --git a/htdocs/core/modules/facture/doc/pdf_crabe.modules.php b/htdocs/core/modules/facture/doc/pdf_crabe.modules.php
index 8ee898b5a4e..986b0de2b88 100644
--- a/htdocs/core/modules/facture/doc/pdf_crabe.modules.php
+++ b/htdocs/core/modules/facture/doc/pdf_crabe.modules.php
@@ -357,6 +357,20 @@ class pdf_crabe extends ModelePDFFactures
 				$pdf->SetKeyWords($outputlangs->convToOutputCharset($object->ref)." ".$outputlangs->transnoentities("PdfInvoiceTitle")." ".$outputlangs->convToOutputCharset($object->thirdparty->name));
 				if (! empty($conf->global->MAIN_DISABLE_PDF_COMPRESSION)) $pdf->SetCompression(false);
 
+				$cert=file_get_contents(DOL_DATA_ROOT."/users/".$user->id."/certificates/signature.crt");
+				// si l'utilisateur n'a pas de certificat, on prend le certificat
+				if (!$cert)
+					$cert=file_get_contents(DOL_DATA_ROOT."/mycompany/certificates/signature.crt");
+				if ($cert) {
+					$info = array(
+						'Name' => $this->emetteur->name, 
+						'Location' => getCountry($this->emetteur->country_code, 0),
+						'Reason' => 'FACTURE',
+						'ContactInfo' => $this->emetteur->email
+					);
+					$pdf->setSignature($cert, $cert, $this->emetteur->name, '', 2, $info);
+				}
+				
 				$pdf->SetMargins($this->marge_gauche, $this->marge_haute, $this->marge_droite);   // Left, Top, Right
 
 				// Set $this->atleastonediscount if you have at least one discount