diff --git a/cosmo-bootstrap/Dockerfile b/cosmo-bootstrap/Dockerfile
index ea524ba..6ce47e4 100644
--- a/cosmo-bootstrap/Dockerfile
+++ b/cosmo-bootstrap/Dockerfile
@@ -39,6 +39,10 @@ RUN : \
  && shed libc/elf/elf.h '/"libc\/elf\/struct\/ehdr.h"/i\\#include "libc/elf/struct/dyn.h"' \
 # awk's pledge isn't working for me for whatever reason \
  && shed third_party/awk/main.c '/pledge.*{/,/}/d' \
+# this feature detection is slightly broken (for now) \
+ && shed libc/calls/unveil.c \
+'/^  if (landlock_abi_version == -1) {/i\\
+  landlock_abi_version = landlock_create_ruleset(0, 0, LANDLOCK_CREATE_RULESET_VERSION);' \
 # create a mapping from flavor to mode (possibly an empty string) \
  && { [ "$COSMO_FLAVOR" != def ] && mode="$COSMO_FLAVOR" || mode= ;} \
  && printf '%s="%s"\n' >env \