diff --git a/build-constraints.yaml b/build-constraints.yaml
index 44e7cb89..dc34e29b 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -39,6 +39,7 @@ packages:
         - arrowp-qq
         - clr-marshal
         - clr-host
+        - hexml-lens
         - hp2pretty # With permission of Claude Heiland-Allend
         - floatshow # https://bitbucket.org/dafis/floatshow/issues/1/add-to-stackage
         # - threepenny-editors # GHC 8.2.1 via threepenny-gui