diff --git a/include/lib/stdlib/stdbool.h b/include/lib/stdlib/stdbool.h
index 48070c1..e39aef7 100644
--- a/include/lib/stdlib/stdbool.h
+++ b/include/lib/stdlib/stdbool.h
@@ -1,43 +1,17 @@
 /*
- * Copyright (c) 2000 Jeroen Ruigrok van der Werven <asmodai@FreeBSD.org>
- * All rights reserved.
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
  *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * $FreeBSD$
+ * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __bool_true_false_are_defined
-#define	__bool_true_false_are_defined	1
+#ifndef STDBOOL_H
+#define STDBOOL_H
 
-#ifndef __cplusplus
+#define bool	_Bool
 
-#define	false	0
-#define	true	1
+#define true	1
+#define false	0
 
-#define	bool	_Bool
-#if __STDC_VERSION__ < 199901L && __GNUC__ < 3 && !defined(__INTEL_COMPILER)
-typedef	int	_Bool;
-#endif
+#define __bool_true_false_are_defined	1
 
-#endif /* !__cplusplus */
-#endif /* __bool_true_false_are_defined */
+#endif /* STDBOOL_H */