diff --git a/htdocs/install/upgrade.php b/htdocs/install/upgrade.php
index 3a0800ed771..973871c0f0b 100644
--- a/htdocs/install/upgrade.php
+++ b/htdocs/install/upgrade.php
@@ -131,6 +131,34 @@ if (! isset($_GET["action"]) || $_GET["action"] == "upgrade")
 	}
 
 
+	// Suppression vieilles contraintes sans noms et en doubles
+	// Les contraintes indesirables ont un nom qui commence par 0_ ou se termine par ibfk_999
+    $listtables=array('llx_product_fournisseur_price','llx_fichinter','llx_facture_fourn','llx_propal','llx_socpeople','llx_telephonie_adsl_fournisseur','llx_telephonie_client_stats','llx_telephonie_contact_facture','llx_telephonie_societe_ligne','llx_telephonie_tarif_client');
+    foreach ($listtables as $val)
+	{
+		$sql = "SHOW CREATE TABLE ".$val;
+	    $resql = $db->query($sql);
+	    if (! $resql) dolibarr_print_error($db);
+		{
+			$values=$db->fetch_array($resql);
+			$i=0;
+			$createsql=$values[1];
+			while (eregi('CONSTRAINT `(0_[0-9a-zA-Z]+|[_0-9a-zA-Z]+_ibfk_[0-9]+)`',$createsql,$reg) && $i < 100)
+			{
+				$sqldrop="ALTER TABLE ".$val." DROP FOREIGN KEY ".$reg[1];
+				$resqldrop = $db->query($sqldrop);
+				if ($resqldrop)
+				{
+					print '<tr><td colspan="2">'.$sqldrop.";</td></tr>\n";
+				}
+				$createsql=eregi_replace('CONSTRAINT `'.$reg[1].'`','XXX',$createsql);
+				$i++;
+			}
+			$db->free($resql);
+		}
+	
+	}
+	
 
 	/***************************************************************************************
 	*