diff --git a/libc/stdio/stdio.cpp b/libc/stdio/stdio.cpp
index b4b2a36..d627556 100644
--- a/libc/stdio/stdio.cpp
+++ b/libc/stdio/stdio.cpp
@@ -940,11 +940,21 @@
   return __vfprintf(fp, fmt, ap);
 }
 
+int vfscanf(FILE* fp, const char* fmt, va_list ap) {
+  ScopedFileLock sfl(fp);
+  return __svfscanf(fp, fmt, ap);
+}
+
 int vfwprintf(FILE* fp, const wchar_t* fmt, va_list ap) {
   ScopedFileLock sfl(fp);
   return __vfwprintf(fp, fmt, ap);
 }
 
+int vfwscanf(FILE* fp, const wchar_t* fmt, va_list ap) {
+  ScopedFileLock sfl(fp);
+  return __vfwscanf(fp, fmt, ap);
+}
+
 int vprintf(const char* fmt, va_list ap) {
   return vfprintf(stdout, fmt, ap);
 }