diff --git a/include/lib/libc/aarch64/stddef_.h b/include/lib/libc/aarch64/stddef_.h
index b7d8209..6ecc606 100644
--- a/include/lib/libc/aarch64/stddef_.h
+++ b/include/lib/libc/aarch64/stddef_.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2018-2019, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -12,9 +12,4 @@
 #define SIZET_
 #endif
 
-#ifndef _PTRDIFF_T
-typedef long ptrdiff_t;
-#define _PTRDIFF_T
-#endif
-
 #endif /* STDDEF__H */
diff --git a/include/lib/libc/aarch64/stdint_.h b/include/lib/libc/aarch64/stdint_.h
deleted file mode 100644
index 25680bb..0000000
--- a/include/lib/libc/aarch64/stdint_.h
+++ /dev/null
@@ -1,125 +0,0 @@
-/*
- * Copyright (c) 2018-2019, ARM Limited and Contributors. All rights reserved.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
-#define INT8_MAX  0x7F
-#define INT8_MIN  (-INT8_MAX - 1)
-#define UINT8_MAX 0xFFU
-
-#define INT16_MAX  0x7FFF
-#define INT16_MIN  (-INT16_MAX - 1)
-#define UINT16_MAX 0xFFFFU
-
-#define INT32_MAX  0x7FFFFFFF
-#define INT32_MIN  (-INT32_MAX - 1)
-#define UINT32_MAX 0xFFFFFFFFU
-
-#define INT64_MAX  0x7FFFFFFFFFFFFFFFLL
-#define INT64_MIN  (-INT64_MAX - 1LL)
-#define UINT64_MAX 0xFFFFFFFFFFFFFFFFULL
-
-#define INT_LEAST8_MIN  INT8_MIN
-#define INT_LEAST8_MAX  INT8_MAX
-#define UINT_LEAST8_MAX UINT8_MAX
-
-#define INT_LEAST16_MIN  INT16_MIN
-#define INT_LEAST16_MAX  INT16_MAX
-#define UINT_LEAST16_MAX UINT16_MAX
-
-#define INT_LEAST32_MIN  INT32_MIN
-#define INT_LEAST32_MAX  INT32_MAX
-#define UINT_LEAST32_MAX UINT32_MAX
-
-#define INT_LEAST64_MIN  INT64_MIN
-#define INT_LEAST64_MAX  INT64_MAX
-#define UINT_LEAST64_MAX UINT64_MAX
-
-#define INT_FAST8_MIN  INT32_MIN
-#define INT_FAST8_MAX  INT32_MAX
-#define UINT_FAST8_MAX UINT32_MAX
-
-#define INT_FAST16_MIN  INT32_MIN
-#define INT_FAST16_MAX  INT32_MAX
-#define UINT_FAST16_MAX UINT32_MAX
-
-#define INT_FAST32_MIN  INT32_MIN
-#define INT_FAST32_MAX  INT32_MAX
-#define UINT_FAST32_MAX UINT32_MAX
-
-#define INT_FAST64_MIN  INT64_MIN
-#define INT_FAST64_MAX  INT64_MAX
-#define UINT_FAST64_MAX UINT64_MAX
-
-#define INTPTR_MIN  INT64_MIN
-#define INTPTR_MAX  INT64_MAX
-#define UINTPTR_MAX UINT64_MAX
-
-#define INTMAX_MIN  INT64_MIN
-#define INTMAX_MAX  INT64_MAX
-#define UINTMAX_MAX UINT64_MAX
-
-#define PTRDIFF_MIN INT64_MIN
-#define PTRDIFF_MAX INT64_MAX
-
-#define SIZE_MAX UINT64_MAX
-
-#define INT8_C(x)  x
-#define INT16_C(x) x
-#define INT32_C(x) x
-#define INT64_C(x) x ## LL
-
-#define UINT8_C(x)  x
-#define UINT16_C(x) x
-#define UINT32_C(x) x ## U
-#define UINT64_C(x) x ## ULL
-
-#define INTMAX_C(x)  x ## LL
-#define UINTMAX_C(x) x ## ULL
-
-typedef signed char int8_t;
-typedef short int16_t;
-typedef int int32_t;
-typedef long long int64_t;
-
-typedef unsigned char uint8_t;
-typedef unsigned short uint16_t;
-typedef unsigned int uint32_t;
-typedef unsigned long long uint64_t;
-
-typedef signed char int8_least_t;
-typedef short int16_least_t;
-typedef int int32_least_t;
-typedef long long int64_least_t;
-
-typedef unsigned char uint8_least_t;
-typedef unsigned short uint16_least_t;
-typedef unsigned int uint32_least_t;
-typedef unsigned long long uint64_least_t;
-
-typedef int int8_fast_t;
-typedef int int16_fast_t;
-typedef int int32_fast_t;
-typedef long long int64_fast_t;
-
-typedef unsigned int uint8_fast_t;
-typedef unsigned int uint16_fast_t;
-typedef unsigned int uint32_fast_t;
-typedef unsigned long long uint64_fast_t;
-
-typedef long intptr_t;
-typedef unsigned long uintptr_t;
-
-/*
- * Conceptually, these are supposed to be the largest integers representable in C,
- * but GCC and Clang define them as long long for compatibility.
- */
-typedef long long intmax_t;
-typedef unsigned long long uintmax_t;
-
-typedef long register_t;
-typedef unsigned long u_register_t;
-
-typedef __int128 int128_t;
-typedef unsigned __int128 uint128_t;
diff --git a/include/lib/libc/aarch64/stdlib_.h b/include/lib/libc/aarch64/stdlib_.h
index 81a39d1..531308a 100644
--- a/include/lib/libc/aarch64/stdlib_.h
+++ b/include/lib/libc/aarch64/stdlib_.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2018-2019, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -12,7 +12,4 @@
 #define SIZET_
 #endif
 
-#define EXIT_FAILURE 1
-#define EXIT_SUCCESS 0
-
 #endif /* STDLIB__H */
diff --git a/include/lib/libc/aarch64/time_.h b/include/lib/libc/aarch64/time_.h
index 68ab1b8..8b298a3 100644
--- a/include/lib/libc/aarch64/time_.h
+++ b/include/lib/libc/aarch64/time_.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2018-2019, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -12,6 +12,4 @@
 #define SIZET_
 #endif
 
-typedef long int time_t;
-
 #endif /* TIME__H */