diff --git a/build-constraints.yaml b/build-constraints.yaml
index 74a1fb2a..21574e82 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1526,7 +1526,7 @@ packages:
         - mwc-random-monad
 
     "Flavio Corpa <flaviocorpa@gmail.com> @kutyel":
-        - language-avro
+        - language-avro < 0 # via avro
 
     "Matvey Aksenov <matvey.aksenov@gmail.com> @supki":
         - terminal-size
@@ -3164,7 +3164,7 @@ packages:
         - arbor-lru-cache
         - arbor-postgres
         - asif
-        - avro
+        - avro < 0 # https://github.com/haskell-works/avro/issues/177
         - bits-extra
         - hw-balancedparens
         - hw-bits