diff --git a/build-constraints.yaml b/build-constraints.yaml
index f1a36781..aad92c32 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1963,6 +1963,9 @@ packages:
         # https://github.com/fpco/stackage/issues/1185
         - quickcheck-instances
 
+        # https://github.com/fpco/stackage/issues/1204
+        - swagger2 < 2.0
+
 # end of packages