diff --git a/build-constraints.yaml b/build-constraints.yaml
index 7ee1627b..b92feb28 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1630,6 +1630,9 @@ packages:
         # Can be removed after > 1.15.1.1 is out.
         - pandoc < 1.15.1.1 || > 1.15.1.1
 
+        # https://github.com/fpco/stackage/issues/942
+        - semigroups < 0.18
+
 # end of packages