diff --git a/wsmeext/sphinxext.py b/wsmeext/sphinxext.py
index 749fd3a..6b3da2a 100644
--- a/wsmeext/sphinxext.py
+++ b/wsmeext/sphinxext.py
@@ -374,7 +374,7 @@ class FunctionDirective(PyMethod):
     objtype = 'function'
 
     def get_signature_prefix(self, sig):
-        return 'function '
+        return []
 
 
 def document_function(funcdef, docstrings=None, protocols=['restjson']):