diff --git a/build-constraints.yaml b/build-constraints.yaml
index cdf50482..965f1fec 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -32,7 +32,7 @@ packages:
         # - yesod-auth-bcryptdb # conduit 1.3, yesod 1.6
 
     "Johannes Gerer <oss@johannesgerer.com>":
-        - buchhaltung # GHC 8.4 build failure
+        - buchhaltung < 0 # GHC 8.4 build failure
 
     "Tom McLaughlin <tom@codedown.io> @thomasjm":
         - aeson-typescript