diff --git a/htdocs/lib/databases/mssql.lib.php b/htdocs/lib/databases/mssql.lib.php
index 0835713f6da..581dc5f23c5 100644
--- a/htdocs/lib/databases/mssql.lib.php
+++ b/htdocs/lib/databases/mssql.lib.php
@@ -815,7 +815,7 @@ class DoliDb
 	}
 	
 	function getDefaultCollationConnection(){
-		$resql=$this->query('SELECT SERVERPROPERTY(''collation'')');
+		$resql=$this->query("SELECT SERVERPROPERTY('collation')");
 		 if (!$resql)
 	   {
 			// version Mysql < 4.1.1