diff --git a/build-constraints.yaml b/build-constraints.yaml
index cc97af47..ca6f20fd 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3319,6 +3319,7 @@ packages:
         # https://github.com/fpco/stackage/issues/2659
         - haddock-library < 1.4.4
         - haddock-api < 2.18.1
+        - haddock < 2.18.1
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of