diff --git a/camelot/core.py b/camelot/core.py
index 63425cc6..fef5a35b 100644
--- a/camelot/core.py
+++ b/camelot/core.py
@@ -597,7 +597,7 @@ def to_html(self, path, **kwargs):
 
         """
         html_string = self.df.to_html(**kwargs)
-        with open(path, 'w') as f:
+        with open(path, 'w', encoding='utf-8') as f:
             f.write(html_string)
 
     def to_sqlite(self, path, **kwargs):