diff --git a/build-constraints.yaml b/build-constraints.yaml
index ed1f36c9..77391f9e 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -989,6 +989,9 @@ packages:
         - witherable
         - xml-lens
 
+    "Peter Harpending <peter@harpending.org> @pharpend":
+        - exceptional
+
     "Stackage upper bounds":
         # https://github.com/fpco/stackage/issues/476
         - vector-space < 0.10