diff --git a/classes/API/Injector/UserAgentInjector.php b/classes/API/Injector/UserAgentInjector.php
index 0677b208..c152c446 100644
--- a/classes/API/Injector/UserAgentInjector.php
+++ b/classes/API/Injector/UserAgentInjector.php
@@ -70,8 +70,8 @@ protected function getUserAgent()
             _PS_VERSION_,
             $this->module->version,
             PHP_VERSION,
-            str_replace(' ', '_', php_uname('s') . ' ' . php_uname('r')),
-            php_uname('m')
+            function_exists('php_uname') ? str_replace(' ', '_', php_uname('s') . ' ' . php_uname('r')) : 'Undefined',
+            function_exists('php_uname') ? php_uname('m') : 'Undefined'
         );
     }
 }