diff --git a/build/fbcode_builder/manifests/fbthrift b/build/fbcode_builder/manifests/fbthrift
index 21c9f3c49..072dd4512 100644
--- a/build/fbcode_builder/manifests/fbthrift
+++ b/build/fbcode_builder/manifests/fbthrift
@@ -30,3 +30,4 @@ fbcode/thrift = thrift
 ^fbcode/thrift/thrift-config\.h$
 ^fbcode/thrift/perf/canary.py$
 ^fbcode/thrift/perf/loadtest.py$
+^fbcode/thrift/.castle/.*
diff --git a/build/fbcode_builder/manifests/fbthrift-source b/build/fbcode_builder/manifests/fbthrift-source
index 72cfc3f10..7af0d6dda 100644
--- a/build/fbcode_builder/manifests/fbthrift-source
+++ b/build/fbcode_builder/manifests/fbthrift-source
@@ -18,3 +18,4 @@ fbcode/thrift = thrift
 ^fbcode/thrift/thrift-config\.h$
 ^fbcode/thrift/perf/canary.py$
 ^fbcode/thrift/perf/loadtest.py$
+^fbcode/thrift/.castle/.*