diff --git a/build-constraints.yaml b/build-constraints.yaml
index c87bb43c..5ea41184 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2858,7 +2858,7 @@ packages:
         - numhask-range
         - perf
         - online < 0 # GHC 8.4 via numhask
-        # - chart-unit # lens 4.16 via diagrams
+        - chart-unit
 
     "Iphigenia Df <iphydf@gmail.com> @iphydf":
         - data-msgpack