diff --git a/pubs/apis.py b/pubs/apis.py
index 8c95126..0a0e449 100644
--- a/pubs/apis.py
+++ b/pubs/apis.py
@@ -3,15 +3,19 @@
 import requests
 from bs4 import BeautifulSoup
 
+
 def doi2bibtex(doi):
     """Return a bibtex string of metadata from a DOI"""
 
     url = 'http://dx.doi.org/{}'.format(doi)
     headers = {'accept': 'application/x-bibtex'}
     r = requests.get(url, headers=headers)
+    if r.encoding is None:
+        r.encoding = 'utf8'  # Do not rely on guessing from request
 
     return r.text
 
+
 def isbn2bibtex(isbn):
     """Return a bibtex string of metadata from a DOI"""