diff --git a/build-constraints.yaml b/build-constraints.yaml
index a237a229..5a1f0696 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2944,7 +2944,7 @@ packages:
         - boomerang
         - happstack-hsp
         - happstack-jmacro
-        - happstack-server
+        - happstack-server < 7.8.0  # https://github.com/commercialhaskell/stackage/issues/6657
         - happstack-server-tls
         - hsx-jmacro
         - ixset