diff --git a/build-constraints.yaml b/build-constraints.yaml
index c5c044bc..86aaba00 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2844,7 +2844,7 @@ packages:
     "Tony Day <tonyday567@gmail.com> @tonyday567":
         - numhask
         - numhask-prelude
-        - numhask-range
+        # - numhask-range # BLOCK https://github.com/tonyday567/numhask-range/issues/6
         - perf
         - online < 0 # GHC 8.4 via numhask
         # - chart-unit # lens 4.16 via diagrams