diff --git a/build-constraints.yaml b/build-constraints.yaml
index 80cccbd0..4dc9c0ac 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -5628,6 +5628,7 @@ expected-test-failures:
     # re-enabled, but will eventually fail again. Only remove these
     # from expected-failures if we know a fix has been released.
     - aeson-lens # https://github.com/tanakh/aeson-lens/issues/10
+    - base64 # https://github.com/emilypi/base64/issues/31
     - cabal-debian # https://github.com/ddssff/cabal-debian/issues/50
     - capataz # https://github.com/roman/Haskell-capataz/issues/6
     - concurrent-extra # https://github.com/basvandijk/concurrent-extra/issues/12