diff --git a/build-constraints.yaml b/build-constraints.yaml
index b94f0a0b3..8825d011c 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1799,8 +1799,8 @@ packages:
         - servant
         - servant-blaze
         - servant-cassava
-        - servant-client
-        - servant-client-core
+        - servant-client < 0.20.1 # https://github.com/commercialhaskell/stackage/issues/7424
+        - servant-client-core < 0.20.1 # https://github.com/commercialhaskell/stackage/issues/7424
         - servant-conduit
         - servant-docs
         - servant-foreign