diff --git a/build-constraints.yaml b/build-constraints.yaml
index 6198179d..e6566fdf 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -6517,6 +6517,9 @@ skipped-tests:
     # These can periodically be checked for updates;
     # just remove these lines and run `stackage-curator check' to verify.
 
+    # fails with ghc 8.8
+    - alex # as of alex-3.2.4
+
     # Cyclic dependencies
     - base-orphans # via hspec