diff --git a/libc/include/bits/lockf.h b/libc/include/bits/lockf.h
index 655514d..c24f18b 100644
--- a/libc/include/bits/lockf.h
+++ b/libc/include/bits/lockf.h
@@ -40,7 +40,7 @@
 __BEGIN_DECLS
 
 #if defined(__USE_FILE_OFFSET64)
-int lockf(int, int, off_t) __RENAME(lockf64);
+int lockf(int, int, off_t) __RENAME(lockf64) __INTRODUCED_IN(24);
 #else
 int lockf(int, int, off_t) __INTRODUCED_IN(24);
 #endif