diff --git a/bento.info b/bento.info
index 659247d1..81910d34 100644
--- a/bento.info
+++ b/bento.info
@@ -38,6 +38,9 @@ Library:
         skimage.io._plugins, skimage.measure, skimage.morphology,
         skimage.scripts, skimage.restoration, skimage.segmentation,
         skimage.transform, skimage.util
+    Extension: skimage.__check_build._check_build
+        Sources:
+            skimage/__check_build/_check_build.pyx    
     Extension: skimage.io._plugins._colormixer
         Sources:
             skimage/io/_plugins/_colormixer.pyx