diff --git a/build-constraints.yaml b/build-constraints.yaml
index 96d8f397..ef982146 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -413,6 +413,9 @@ packages:
         - profiterole
         - debug
 
+    "Karl Ostmo <kostmo@gmail.com> @kostmo":
+        - perfect-hash-generator
+
     "Alan Zimmerman @alanz":
         - ghc-exactprint
         - haskell-lsp