diff --git a/src/xrEngine/IGame_Persistent.h b/src/xrEngine/IGame_Persistent.h
index 766aeebb10f..ad4cc84b344 100644
--- a/src/xrEngine/IGame_Persistent.h
+++ b/src/xrEngine/IGame_Persistent.h
@@ -64,7 +64,7 @@ class ENGINE_API IGame_Persistent :
             for (int i = 0; i < n; ++i)
             {
                 _GetItem(cmd_line, i, m_params[i], '/');
-                strlwr(m_params[i]);
+                xr_strlwr(m_params[i]);
             }
         }
     };