diff --git a/mingw-w64-headers/include/stdio.h b/mingw-w64-headers/include/stdio.h
index b4468d8..85f101f 100755
--- a/mingw-w64-headers/include/stdio.h
+++ b/mingw-w64-headers/include/stdio.h
@@ -88,7 +88,13 @@
 #endif
 
 #ifndef _STDIO_DEFINED
+#ifdef _WIN64
   _CRTIMP FILE *__cdecl __iob_func(void);
+#else
+extern FILE (*_imp___iob)[];	/* A pointer to an array of FILE */
+#define __iob_func()	(*_imp___iob)
+#endif
+#define _iob __iob_func()
 #endif
 
 #ifndef _FPOS_T_DEFINED
diff --git a/mingw-w64-headers/include/wchar.h b/mingw-w64-headers/include/wchar.h
index a708a3a..92066e8 100755
--- a/mingw-w64-headers/include/wchar.h
+++ b/mingw-w64-headers/include/wchar.h
@@ -47,7 +47,13 @@
 #endif
 
 #ifndef _STDIO_DEFINED
+#ifdef _WIN64
   _CRTIMP FILE *__cdecl __iob_func(void);
+#else
+extern FILE (*_imp___iob)[];	/* A pointer to an array of FILE */
+#define __iob_func()	(*_imp___iob)
+#endif
+#define _iob __iob_func()
 #endif
 
 #ifndef _STDSTREAM_DEFINED