diff --git a/build-constraints.yaml b/build-constraints.yaml
index 222ce41d..cc97af47 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3318,6 +3318,7 @@ packages:
 
         # https://github.com/fpco/stackage/issues/2659
         - haddock-library < 1.4.4
+        - haddock-api < 2.18.1
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of