Use NULL instead of 0
@@ -86,7 +86,7 @@ int main( void )
#define DFL_MAX_PATHLEN -1
#define DFL_SIG_ALG MBEDTLS_MD_SHA256
#define DFL_KEY_USAGE 0
-#define DFL_EXT_KEY_USAGE 0
+#define DFL_EXT_KEY_USAGE NULL
#define DFL_NS_CERT_TYPE 0
#define DFL_VERSION 3
#define DFL_AUTH_IDENT 1
