diff --git a/tests/connection.inc b/tests/connection.inc
index d043a61..b8886ff 100644
--- a/tests/connection.inc
+++ b/tests/connection.inc
@@ -15,7 +15,7 @@ $username = $user;
 // IBM i (PASE)
 $myos = PHP_OS;
 if (strpos('x'.$myos,'AIX') > 0) {
-  $myos = `uname`;
+  $myos = shell_exec("uname");
 }
 if (strpos($myos,'400') > 0) {
   if (strpos($_SERVER["PHP_SELF"],"V6") === false) {