diff --git a/build-constraints.yaml b/build-constraints.yaml
index 1412bdff..c44a9799 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -6919,6 +6919,9 @@ packages:
       # https://github.com/commercialhaskell/stackage/issues/5968
       - persistent < 2.12
 
+      # https://github.com/commercialhaskell/stackage/issues/5969
+      - crackNum < 3
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of