diff --git a/libc/stdio/local.h b/libc/stdio/local.h
index d306a21..1ecf122 100644
--- a/libc/stdio/local.h
+++ b/libc/stdio/local.h
@@ -204,6 +204,7 @@
 __LIBC32_LEGACY_PUBLIC__ int _fwalk(int (*)(FILE*));
 
 off64_t __sseek64(void*, off64_t, int);
+int __sflush_locked(FILE*);
 int __swhatbuf(FILE*, size_t*, int*);
 wint_t __fgetwc_unlock(FILE*);
 wint_t __ungetwc(wint_t, FILE*);