diff --git a/setup/extensions.py b/setup/build.py
similarity index 100%
rename from setup/extensions.py
rename to setup/build.py
diff --git a/setup/commands.py b/setup/commands.py
index 3e7dfedcf9..14cf7959fa 100644
--- a/setup/commands.py
+++ b/setup/commands.py
@@ -32,7 +32,7 @@ get_translations = GetTranslations()
 iso639 = ISO639()
 iso3166 = ISO3166()
 
-from setup.extensions import Build
+from setup.build import Build
 build = Build()
 
 from setup.mathjax import MathJax