diff --git a/build/fbcode_builder/manifests/fbthrift b/build/fbcode_builder/manifests/fbthrift
index 21c9f3c49bf3adaed5a3572f02171851a76af435..072dd451220be8745496ea16b88f1838047c6e9b 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 72cfc3f107c3ba7b6f18089aaca97cd30a05880b..7af0d6ddac0e3d3dc28b7e34109a8fc2a770b1b3 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/.*