diff --git a/build-constraints.yaml b/build-constraints.yaml
index 9502b185..5601e4de 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2075,6 +2075,9 @@ expected-haddock-failures:
     # not sure why
     - growler
 
+    # https://github.com/iand675/metrics/issues/5
+    - metrics
+
 # end of expected-haddock-failures