diff --git a/build-constraints.yaml b/build-constraints.yaml
index 0342b9f4..0beb1853 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2972,7 +2972,7 @@ packages:
         - wai-session-postgresql
 
     "Haisheng Wu <freizl@gmail.com> @freizl":
-        - hoauth2
+        - hoauth2 < 2.0 # https://github.com/commercialhaskell/stackage/issues/6424
 
     "Falko Peters <falko.peters@gmail.com> @informatikr":
         - scrypt