diff --git a/include/lib/libc/aarch32/limits_.h b/include/lib/libc/aarch32/limits_.h
index 26cec17..a67ec53 100644
--- a/include/lib/libc/aarch32/limits_.h
+++ b/include/lib/libc/aarch32/limits_.h
@@ -1,11 +1,11 @@
 /*
- * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2018-2023, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
 #define SCHAR_MAX  0x7F
-#define SCHAR_MIN  (-SCHAR_MIN - 1)
+#define SCHAR_MIN  (-SCHAR_MAX - 1)
 #define CHAR_MAX   0x7F
 #define CHAR_MIN   (-CHAR_MAX - 1)
 #define UCHAR_MAX  0xFFU
diff --git a/include/lib/libc/aarch64/limits_.h b/include/lib/libc/aarch64/limits_.h
index e36cfe7..1bb0681 100644
--- a/include/lib/libc/aarch64/limits_.h
+++ b/include/lib/libc/aarch64/limits_.h
@@ -1,11 +1,11 @@
 /*
- * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2018-2023, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
 #define SCHAR_MAX  0x7F
-#define SCHAR_MIN  (-SCHAR_MIN - 1)
+#define SCHAR_MIN  (-SCHAR_MAX - 1)
 #define CHAR_MAX   0x7F
 #define CHAR_MIN   (-CHAR_MAX - 1)
 #define UCHAR_MAX  0xFFU