diff --git a/build-constraints.yaml b/build-constraints.yaml
index 52cb54ff..a6cbfb91 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3306,7 +3306,8 @@ packages:
         - cusolver < 0 # build failure with GHC 8.4
         - cusparse < 0 # build failure with GHC 8.4
         - data-inttrie < 0 # build failure with GHC 8.4
-        - data-memocombinators < 0 # build failure with GHC 8.4
+        # - data-memocombinators < 0 # build failure with GHC 8.4
+        - data-memocombinators # todo: remove
         - diff3 < 0 # build failure with GHC 8.4
         - distance < 0 # build failure with GHC 8.4
         - distribution < 0 # build failure with GHC 8.4