diff --git a/build-constraints.yaml b/build-constraints.yaml
index d35b59e4..285f016e 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3269,6 +3269,7 @@ packages:
         - PSQueue < 0 # build failure with GHC 8.4 (nowhere to report, it's ancient just let it die)
         - Rasterific < 0 # build failure with GHC 8.4 https://github.com/Twinside/Rasterific/issues/37
         - b9 < 0 # build failure with GHC 8.4 https://github.com/sheyll/b9-vm-image-builder/issues/4
+        - enummapset < 0 # build failure with GHC 8.4 https://github.com/michalt/enummapset/issues/11
         - hamtsolo < 0 # build failure with conduit 1.3 https://github.com/tfc/hamtsolo/issues/3
         - hashtables < 0 # build failure with GHC 8.4 https://github.com/gregorycollins/hashtables/issues/45
         - heap < 0 # build failure with GHC 8.4 https://github.com/pruvisto/heap/issues/5
@@ -3436,7 +3437,6 @@ packages:
         - cmark < 0 # DependencyFailed (PackageName "markdown")
         - cmark-highlight < 0 # GHC 8.4 via cmark
         - tasty-html < 0 # BuildFailureException Process exited with ExitFailure 1: ./Setup build
-        - enummapset < 0 # BuildFailureException Process exited with ExitFailure 1: ./Setup build
         - fingertree-psqueue < 0 # BuildFailureException Process exited with ExitFailure 1: ./Setup build
         - set-cover < 0 # DependencyFailed (PackageName "enummapset")