diff --git a/build-constraints.yaml b/build-constraints.yaml
index 96d9e99b..ae599cdc 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1249,6 +1249,10 @@ packages:
         - microlens-th
         - shortcut-links
 
+    "Takano Akio aljee@hyper.cx @takano-akio":
+        - fast-builder
+        - filelock
+
     "Stackage upper bounds":
         # https://github.com/fpco/stackage/issues/537
         - zlib < 0.6