diff --git a/f8/app.cc b/f8/app.cc
index bf382fa..549cd54 100644
--- a/f8/app.cc
+++ b/f8/app.cc
@@ -91,6 +91,7 @@ namespace f8
                     max_run_delay_time_ = end_tick - begin_tick;
                 }
                 Schedule();
+                end_tick = a8::XGetTickCount();
                 delta_time = end_tick - begin_tick;
             }
             UnInit();