diff --git a/libc/include/android/fdsan.h b/libc/include/android/fdsan.h
index 908619e..2aa29e3 100644
--- a/libc/include/android/fdsan.h
+++ b/libc/include/android/fdsan.h
@@ -113,21 +113,21 @@
 /*
  * Create an owner tag with the specified type and least significant 56 bits of tag.
  */
-uint64_t android_fdsan_create_owner_tag(enum android_fdsan_owner_type type, uint64_t tag) __INTRODUCED_IN_FUTURE;
+uint64_t android_fdsan_create_owner_tag(enum android_fdsan_owner_type type, uint64_t tag) __INTRODUCED_IN_FUTURE __attribute__((__weak__));
 
 /*
  * Exchange a file descriptor's tag.
  *
  * Logs and aborts if the fd's tag does not match expected_tag.
  */
-void android_fdsan_exchange_owner_tag(int fd, uint64_t expected_tag, uint64_t new_tag) __INTRODUCED_IN_FUTURE;
+void android_fdsan_exchange_owner_tag(int fd, uint64_t expected_tag, uint64_t new_tag) __INTRODUCED_IN_FUTURE __attribute__((__weak__));
 
 /*
  * Close a file descriptor with a tag, and resets the tag to 0.
  *
  * Logs and aborts if the tag is incorrect.
  */
-int android_fdsan_close_with_tag(int fd, uint64_t tag) __INTRODUCED_IN_FUTURE;
+int android_fdsan_close_with_tag(int fd, uint64_t tag) __INTRODUCED_IN_FUTURE __attribute__((__weak__));
 
 enum android_fdsan_error_level {
   // No errors.
@@ -146,7 +146,7 @@
 /*
  * Get the error level.
  */
-enum android_fdsan_error_level android_fdsan_get_error_level() __INTRODUCED_IN_FUTURE;
+enum android_fdsan_error_level android_fdsan_get_error_level() __INTRODUCED_IN_FUTURE __attribute__((__weak__));
 
 /*
  * Set the error level and return the previous state.
@@ -161,6 +161,6 @@
  * value, and so should probably only be called in single-threaded contexts
  * (e.g. postfork).
  */
-enum android_fdsan_error_level android_fdsan_set_error_level(enum android_fdsan_error_level new_level) __INTRODUCED_IN_FUTURE;
+enum android_fdsan_error_level android_fdsan_set_error_level(enum android_fdsan_error_level new_level) __INTRODUCED_IN_FUTURE __attribute__((__weak__));
 
 __END_DECLS