diff --git a/build-constraints.yaml b/build-constraints.yaml
index f887816f..2e398fcb 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1019,8 +1019,8 @@ packages:
 
     "Toralf Wittner <tw@dtex.org> @twittner":
         - bytestring-conversion
-        - cql
-        - cql-io
+        - cql < 0 # https://gitlab.com/twittner/cql/issues/3
+        - cql-io < 0 # cql
         - redis-resp < 0 # BuildFailureException Process exited with ExitFailure 1: ./Setup build
         - redis-io < 0 # GHC 8.4 via tinylog
         - swagger