diff --git a/build-constraints.yaml b/build-constraints.yaml
index 0679db99..1829343d 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3382,7 +3382,6 @@ packages:
         # round 2:
         - HSet < 0 # DependencyFailed (PackageName "hashtables")
         - HaTeX < 0 # DependencyFailed (PackageName "matrix")
-        - adler32 < 0 # BuildFailureException Process exited with ExitFailure 1: ./Setup build
         - bookkeeping < 0 # BuildFailureException Process exited with ExitFailure 1: ./Setup build
         - cartel < 0 # BuildFailureException Process exited with ExitFailure 1: ./Setup build
         - cases < 0 # DependencyFailed (PackageName "loch-th")