diff --git a/libc/kernel/tools/defaults.py b/libc/kernel/tools/defaults.py
index 967d0c7..463de12 100644
--- a/libc/kernel/tools/defaults.py
+++ b/libc/kernel/tools/defaults.py
@@ -90,6 +90,8 @@
 kernel_struct_replacements = set(
         [
           "epoll_event",
+          "flock",
+          "flock64",
           "in_addr",
           "ip_mreq_source",
           "ip_msfilter",