diff --git a/build-constraints.yaml b/build-constraints.yaml
index 7f5c48ea..981ae20f 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -268,8 +268,7 @@ packages:
         - distributive
         - either
         - eq
-        # https://github.com/ekmett/ersatz/issues/11 GHC 7.10
-        # - ersatz
+        - ersatz
         - exceptions
         - free
         - graphs