diff --git a/setup.py b/setup.py
index 9a78043e9..59ba73910 100644
--- a/setup.py
+++ b/setup.py
@@ -45,7 +45,7 @@ else:
 
 
 exts = [
-    Extension("spacy.lang", ["spacy/spacy.pyx"], language="c++", include_dirs=includes),
+    Extension("spacy.lang", ["spacy/lang.pyx"], language="c++", include_dirs=includes),
     Extension("spacy.word", ["spacy/word.pyx"], language="c++",
               include_dirs=includes),
     Extension("spacy.ptb3", ["spacy/ptb3.pyx"], language="c++", include_dirs=includes),