diff --git a/doc/conf.py b/doc/conf.py
index 2be89b6f3c3506f167e4734846ac2c9706323d62..eed13503b1ba0a7c3049d502801171ab4249a1f9 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -41,6 +41,9 @@ extensions = [
     'sphinxcontrib.bibtex',
     'sphinx.ext.graphviz',
 ]
+bibtex_bibfiles = [
+    'refs.bib',
+]
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']