diff --git a/abstract-machine/am/src/platform/nemu/ioe/gpu.c b/abstract-machine/am/src/platform/nemu/ioe/gpu.c
index eed7a88..26c5866 100644
--- a/abstract-machine/am/src/platform/nemu/ioe/gpu.c
+++ b/abstract-machine/am/src/platform/nemu/ioe/gpu.c
@@ -40,7 +40,7 @@ void __am_gpu_fbdraw(AM_GPU_FBDRAW_T *ctl) {
     }
   }
   if (ctl->sync) {
-    while (inl(SYNC_ADDR) != 0) ;
+    // while (inl(SYNC_ADDR) != 0) ;
     outl(SYNC_ADDR, 1);
   }
 }