diff --git a/README.rst b/README.rst
index bc99414..3474267 100644
--- a/README.rst
+++ b/README.rst
@@ -355,6 +355,10 @@ Bugs and pull requested can be submitted on GitHub_.
 Changes
 =======
 
+1.1
+~~~
+* BUG: Read source files as bytes.
+
 1.0
 ~~~
 * ENH: `kernprof.py` is now installed as `kernprof`.
diff --git a/kernprof.py b/kernprof.py
index c2b96eb..108d36e 100755
--- a/kernprof.py
+++ b/kernprof.py
@@ -31,7 +31,7 @@
     exec_ = getattr(builtins, "exec")
 
     def execfile(filename, globals=None, locals=None):
-        with open(filename) as f:
+        with open(filename, 'rb') as f:
             exec_(compile(f.read(), filename, 'exec'), globals, locals)
 # =====================================