diff --git a/build-constraints.yaml b/build-constraints.yaml
index 9937e709..def821b6 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -988,6 +988,9 @@ 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