diff --git a/build-constraints.yaml b/build-constraints.yaml
index 11291eeb..ecd92063 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2400,7 +2400,7 @@ packages:
 
     "Sam Rijs <srijs@airpost.net> @srijs":
         - ndjson-conduit
-        - operational-class
+        - operational-class < 0 # https://github.com/srijs/haskell-operational-class/issues/1
         - result
 
     "Daniel Patterson <dbp@dbpmail.net> @dbp":