diff --git a/include/mbedtls/aes.h b/include/mbedtls/aes.h
index d252930..8b9280d 100644
--- a/include/mbedtls/aes.h
+++ b/include/mbedtls/aes.h
@@ -49,9 +49,9 @@
 /* Error codes in range 0x0020-0x0022 */
 #define MBEDTLS_ERR_AES_INVALID_KEY_LENGTH                -0x0020  /**< Invalid key length. */
 #define MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH              -0x0022  /**< Invalid data input length. */
-#define MBEDTLS_ERR_AES_BAD_INPUT_DATA                    -0x0024  /**< Invalid input data. */
 
-/* Error codes in range 0x0023-0x0025 */
+/* Error codes in range 0x0021-0x0025 */
+#define MBEDTLS_ERR_AES_BAD_INPUT_DATA                    -0x0021  /**< Invalid input data. */
 #define MBEDTLS_ERR_AES_FEATURE_UNAVAILABLE               -0x0023  /**< Feature not available. For example, an unsupported AES key size. */
 #define MBEDTLS_ERR_AES_HW_ACCEL_FAILED                   -0x0025  /**< AES hardware accelerator failed. */