diff --git a/tools/program.py b/tools/program.py
index c22bf18b991a8aed6d47a1ea242aa3b7bb02aacc..33bd35c23d0b6676edfb9c537e497eb68b828c4a 100755
--- a/tools/program.py
+++ b/tools/program.py
@@ -18,6 +18,7 @@ from __future__ import print_function
 
 import os
 import sys
+import platform
 import yaml
 import time
 import shutil
@@ -335,8 +336,10 @@ def eval(model, valid_dataloader, post_process_class, eval_class,
         total_frame = 0.0
         total_time = 0.0
         pbar = tqdm(total=len(valid_dataloader), desc='eval model:')
+        max_iter = len(valid_dataloader) - 1 if platform.system(
+        ) == "Windows" else len(valid_dataloader)
         for idx, batch in enumerate(valid_dataloader):
-            if idx >= len(valid_dataloader):
+            if idx >= max_iter:
                 break
             images = batch[0]
             start = time.time()