diff --git a/test/phpunit/PgsqlTest.php b/test/phpunit/PgsqlTest.php
index 04693c017ed..f25ea3ea72f 100644
--- a/test/phpunit/PgsqlTest.php
+++ b/test/phpunit/PgsqlTest.php
@@ -162,6 +162,12 @@ class PgsqlTest extends PHPUnit_Framework_TestCase
         print __METHOD__." result=".$result."\n";
     	$this->assertEquals($result, $sql.' DEFERRABLE INITIALLY IMMEDIATE;');
 
+        // Create a constraint
+		$sql='SELECT a.b, GROUP_CONCAT(a.c) FROM table GROUP BY a.b';
+		$result=DoliDBPgsql::convertSQLFromMysql($sql);
+        print __METHOD__." result=".$result."\n";
+    	$this->assertEquals($result, "SELECT a.b, STRING_AGG(a.c, ',') FROM table GROUP BY a.b");
+    	
     	return $result;
     }
 }