diff --git a/IPython/nbformat/v2/tests/nbexamples.py b/IPython/nbformat/v2/tests/nbexamples.py
index 2f6174b..6b6dd28 100644
--- a/IPython/nbformat/v2/tests/nbexamples.py
+++ b/IPython/nbformat/v2/tests/nbexamples.py
@@ -81,7 +81,8 @@ nb0 = new_notebook(
     metadata=md
 )
 
-nb0_py = """# <nbformat>2</nbformat>
+nb0_py = """# coding: utf-8
+# <nbformat>2</nbformat>
 
 # <htmlcell>