diff --git a/preprocess.py b/preprocess.py
index ff9f119..3f2d0cf 100644
--- a/preprocess.py
+++ b/preprocess.py
@@ -8,7 +8,7 @@ def read_instances_from_file(inst_file, max_sent_len, keep_case):
 
     word_insts = []
     trimmed_sent_count = 0
-    with open(inst_file) as f:
+    with open(inst_file, encoding='utf-8') as f:
         for sent in f:
             if not keep_case:
                 sent = sent.lower()
diff --git a/translate.py b/translate.py
index f062b5b..9663280 100644
--- a/translate.py
+++ b/translate.py
@@ -56,7 +56,7 @@ def main():
 
     translator = Translator(opt)
 
-    with open(opt.output, 'w') as f:
+    with open(opt.output, 'w', encoding='utf-8') as f:
         for batch in tqdm(test_loader, mininterval=2, desc='  - (Test)', leave=False):
             all_hyp, all_scores = translator.translate_batch(*batch)
             for idx_seqs in all_hyp: