diff --git a/build-constraints.yaml b/build-constraints.yaml
index 7ba19d91..1f48f795 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3499,7 +3499,6 @@ packages:
 
         # Transitive failures, reported on https://github.com/fpco/stackage/issues/3394
         - Spock-worker < 0 # GHC 8.4 via HTF
-        - buffer-builder < 0 # GHC 8.4 via HTF
         - ignore < 0 # GHC 8.4 via HTF
         - large-hashable < 0 # GHC 8.4 via HTF
         - haxr < 0 # GHC 8.4 via HaXml
@@ -4297,6 +4296,7 @@ skipped-tests:
     - binary-parser # tasty-quickcheck
     - blaze-html
     - blaze-markup
+    - buffer-builder # ghc 8.4 via HTF via xmlgen https://github.com/skogsbaer/xmlgen/issues/7
     - case-insensitive # HUnit 1.6
     - diagrams-solve # tasty-quickcheck
     - drawille # hspec 2.4