diff --git a/build-constraints.yaml b/build-constraints.yaml
index 77c8b9a0..ac7564d1 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1893,7 +1893,7 @@ packages:
         - tree-fun
         - random-tree
         - clumpiness
-        - find-clumpiness
+        # - find-clumpiness # BLOCKED optparse-applicative https://github.com/GregorySchwartz/find-clumpiness/issues/1
         # - blosum # BLOCKED optparse-applicative https://github.com/GregorySchwartz/blosum/issues/2
 
     "Simon Marechal <bartavelle@gmail.com> @bartavelle":