diff --git a/include/mbedtls/aes.h b/include/mbedtls/aes.h
index cb7d726..5fb020f 100644
--- a/include/mbedtls/aes.h
+++ b/include/mbedtls/aes.h
@@ -90,6 +90,9 @@
 #if defined(MBEDTLS_AES_SCA_COUNTERMEASURES)
     uint32_t frk[8];            /*!< Fake AES round keys. */
 #endif
+#if defined(MBEDTLS_VALIDATE_AES_KEYS_INTEGRITY)
+    uint16_t crc;               /*!< CRC-16 of the set key */
+#endif
 #if defined(MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH) && !defined(MBEDTLS_PADLOCK_C)
     uint32_t buf[44];           /*!< Unaligned data buffer */
 #else /* MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH */