diff --git a/setup.py b/setup.py
index cd3b79cc..1189f990 100644
--- a/setup.py
+++ b/setup.py
@@ -78,18 +78,26 @@ class LazyBuildExtCommandClass(dict):
         return build_ext
 
 
+def window_specialization(typename):
+    """Make an extension for an AdjustedArrayWindow specialization."""
+    return Extension(
+        'zipline.lib._{name}window'.format(name=typename),
+        ['zipline/lib/_{name}window.pyx'.format(name=typename)],
+        depends=['zipline/lib/_windowtemplate.pxi'],
+    )
+
+
 ext_modules = [
     Extension('zipline.assets._assets', ['zipline/assets/_assets.pyx']),
     Extension('zipline.assets.continuous_futures',
               ['zipline/assets/continuous_futures.pyx']),
     Extension('zipline.lib.adjustment', ['zipline/lib/adjustment.pyx']),
     Extension('zipline.lib._factorize', ['zipline/lib/_factorize.pyx']),
-    Extension(
-        'zipline.lib._float64window', ['zipline/lib/_float64window.pyx']
-    ),
-    Extension('zipline.lib._int64window', ['zipline/lib/_int64window.pyx']),
-    Extension('zipline.lib._uint8window', ['zipline/lib/_uint8window.pyx']),
-    Extension('zipline.lib._labelwindow', ['zipline/lib/_labelwindow.pyx']),
+    window_specialization('float64'),
+    window_specialization('int64'),
+    window_specialization('int64'),
+    window_specialization('uint8'),
+    window_specialization('label'),
     Extension('zipline.lib.rank', ['zipline/lib/rank.pyx']),
     Extension('zipline.data._equities', ['zipline/data/_equities.pyx']),
     Extension('zipline.data._adjustments', ['zipline/data/_adjustments.pyx']),