diff --git a/include/mbedtls/platform.h b/include/mbedtls/platform.h
index a121654e2..24c63625f 100644
--- a/include/mbedtls/platform.h
+++ b/include/mbedtls/platform.h
@@ -64,10 +64,6 @@ extern "C" {
 #define MBEDTLS_PLATFORM_HAS_NON_CONFORMING_VSNPRINTF
 #endif
 
-#if defined(__MINGW32__) && !defined(__USE_MINGW_ANSI_STDIO)
-#define __USE_MINGW_ANSI_STDIO 1
-#endif
-
 #if !defined(MBEDTLS_PLATFORM_NO_STD_FUNCTIONS)
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/library/platform.c b/library/platform.c
index 4f8e40f30..8bf6ff5fb 100644
--- a/library/platform.c
+++ b/library/platform.c
@@ -30,6 +30,10 @@
 #include "mbedtls/platform.h"
 #include "mbedtls/platform_util.h"
 
+#if defined(__MINGW32__) && !defined(__USE_MINGW_ANSI_STDIO)
+#define __USE_MINGW_ANSI_STDIO 1
+#endif
+
 #if defined(MBEDTLS_PLATFORM_MEMORY)
 #if !defined(MBEDTLS_PLATFORM_STD_CALLOC)
 static void *platform_calloc_uninit( size_t n, size_t size )