diff --git a/doc/conf.py b/doc/conf.py
index 0db0bc9..20c7053 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -277,5 +277,5 @@
 # Fake imports to avoid actually loading NumPy and libsndfile
 import fake_numpy
 sys.modules['numpy'] = sys.modules['fake_numpy']
-import fake_cffi
-sys.modules['cffi'] = sys.modules['fake_cffi']
+import fake__soundfile
+sys.modules['_soundfile'] = sys.modules['fake__soundfile']
diff --git a/doc/fake_cffi.py b/doc/fake__soundfile.py
similarity index 82%
rename from doc/fake_cffi.py
rename to doc/fake__soundfile.py
index ea1cc30..4887706 100644
--- a/doc/fake_cffi.py
+++ b/doc/fake__soundfile.py
@@ -1,10 +1,7 @@
 """Mock module for Sphinx autodoc."""
 
 
-class FFI(object):
-
-    def cdef(self, _):
-        pass
+class ffi(object):
 
     def dlopen(self, _):
         return self
@@ -16,3 +13,6 @@ def sf_version_string(self):
         return NotImplemented
 
     SFC_GET_FORMAT_INFO = NotImplemented
+
+
+ffi = ffi()