diff --git a/pysnooper/tracer.py b/pysnooper/tracer.py
index 0941140..14bfe72 100644
--- a/pysnooper/tracer.py
+++ b/pysnooper/tracer.py
@@ -47,10 +47,7 @@ def get_local_reprs(frame, variables=()):
 
 class UnavailableSource(object):
     def __getitem__(self, i):
-        content = 'SOURCE IS UNAVAILABLE'
-        if six.PY2:
-            content = content.decode()
-        return content
+        return u'SOURCE IS UNAVAILABLE'
 
 
 source_cache_by_module_name = {}