diff --git a/build-constraints.yaml b/build-constraints.yaml
index 8c116c78..449b6e0e 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1464,6 +1464,9 @@ packages:
         - linear < 1.20
         - reflection < 2.1
 
+        # https://github.com/fpco/stackage/issues/836
+        - singletons < 1.2
+
 # Package flags are applied to individual packages, and override the values of
 # global-flags
 package-flags: