diff --git a/build-constraints.yaml b/build-constraints.yaml
index 04ba737f..7e1e13af 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -799,6 +799,10 @@ package-flags:
     tar:
         old-time: false
 
+    mtl-compat:
+        two-point-one: true
+        two-point-two: false
+
 # By skipping a test suite, we do not pull in the build dependencies
 skipped-tests:
     - ReadArgs # old version of hspec