diff --git a/conftest.py b/conftest.py
index f896561ecf..d5e851fe50 100644
--- a/conftest.py
+++ b/conftest.py
@@ -25,4 +25,5 @@ def pytest_addoption(parser):
 
 
 if sys.version_info < (3, 6):
+    collect_ignore.append('docs/conf.py')  # uses f-strings
     collect_ignore.append('pavement.py')