diff --git a/hyper/tls.py b/hyper/tls.py
index 422b001c..fa216e7e 100644
--- a/hyper/tls.py
+++ b/hyper/tls.py
@@ -122,7 +122,7 @@ def init_context(cert_path=None, cert=None, cert_password=None):
 
     if cert is not None:
         try:
-            basestring
+            basestring  # pragma: no cover
         except NameError:
             basestring = (str, bytes)
         if not isinstance(cert, basestring):