diff --git a/_pytest/fixtures.py b/_pytest/fixtures.py
index 457aa9d4f..27c2b2c5c 100644
--- a/_pytest/fixtures.py
+++ b/_pytest/fixtures.py
@@ -985,8 +985,7 @@ class FixtureManager(object):
             argnames = ()
         usefixtures = flatten(uf_mark.args for uf_mark in node.find_markers("usefixtures"))
         initialnames = argnames
-        if usefixtures is not None:
-            initialnames = tuple(usefixtures) + initialnames
+        initialnames = tuple(usefixtures) + initialnames
         fm = node.session._fixturemanager
         names_closure, arg2fixturedefs = fm.getfixtureclosure(initialnames,
                                                               node)