diff --git a/setup.py b/setup.py
index 870b483..337fdf0 100644
--- a/setup.py
+++ b/setup.py
@@ -1,9 +1,9 @@
 from setuptools import setup
 
-with open("README.md") as f:
+with open("README.md", encoding="utf8") as f:
     readme = f.read()
 
-with open("aioitertools/__init__.py") as f:
+with open("aioitertools/__init__.py", encoding="utf8") as f:
     for line in f:
         if line.startswith("__version__"):
             version = line.split('"')[1]