diff --git a/build-constraints.yaml b/build-constraints.yaml
index 547ea575..673333d2 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -7847,6 +7847,9 @@ packages:
 
         # https://github.com/commercialhaskell/stackage/issues/6932
         - ormolu < 0.6
+
+        # https://github.com/commercialhaskell/stackage/issues/6937
+        - aern2-real < 0.2.12
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of