diff --git a/build-constraints.yaml b/build-constraints.yaml
index 86751b18..16f74c32 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4773,6 +4773,9 @@ packages:
         - data-default-instances-unordered-containers
         - data-default-instances-vector
 
+    "David Spies <dnspies@gmail.com> @davidspies":
+        - fastmemo
+
     "comp <onecomputer00@gmail.com> @1Computer1":
         - errata
         - reorder-expression