diff --git a/build-constraints.yaml b/build-constraints.yaml
index 0e1be59f..22a6fec6 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2238,7 +2238,7 @@ packages:
         - aeson-casing
         - graylog
         - parsec-numeric
-        - mallard
+        # - mallard # https://github.com/AndrewRademacher/mallard/issues/49
         - gdax
 
     "Callum Rogers @CRogers":