diff --git a/lib/libc/mingw/secapi/vsprintf_s.c b/lib/libc/mingw/secapi/vsprintf_s.c
index 45dfb14b11..fd0c4ef13b 100644
--- a/lib/libc/mingw/secapi/vsprintf_s.c
+++ b/lib/libc/mingw/secapi/vsprintf_s.c
@@ -33,8 +33,13 @@ vsprintf_s (char *_DstBuf, size_t _Size, const char *_Format, va_list _ArgList)
   return _stub (_DstBuf, _Size, _Format, _ArgList);
 }
 
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wimplicit-function-declaration"
+
 static int __cdecl
 _int_vsprintf_s (char *_DstBuf, size_t _Size, const char *_Format, va_list _ArgList)
 {
   return __ms_vsnprintf (_DstBuf, _Size, _Format, _ArgList);
 }
+
+#pragma clang diagnostic pop
diff --git a/lib/libc/mingw/stdio/vwscanf.c b/lib/libc/mingw/stdio/vwscanf.c
index 3360eefad1..8310498ffd 100644
--- a/lib/libc/mingw/stdio/vwscanf.c
+++ b/lib/libc/mingw/stdio/vwscanf.c
@@ -10,7 +10,12 @@
 #include <wchar.h>
 #include <stdio.h>
 
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wimplicit-function-declaration"
+
 int __ms_vwscanf (const wchar_t * __restrict__ format, va_list arg)
 {
   return __ms_vfwscanf(stdin, format, arg);
 }
+
+#pragma clang diagnostic pop