diff --git a/build-constraints.yaml b/build-constraints.yaml
index 7f778927..b346311f 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -42,6 +42,7 @@ 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