diff --git a/drivers/auth/crypto_mod.c b/drivers/auth/crypto_mod.c
index 3b3e3ac..4cd0550 100644
--- a/drivers/auth/crypto_mod.c
+++ b/drivers/auth/crypto_mod.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -9,7 +9,6 @@
 #include <debug.h>
 
 /* Variable exported by the crypto library through REGISTER_CRYPTO_LIB() */
-extern const crypto_lib_desc_t crypto_lib_desc;
 
 /*
  * The crypto module is responsible for verifying digital signatures and hashes.
diff --git a/drivers/auth/mbedtls/mbedtls_common.c b/drivers/auth/mbedtls/mbedtls_common.c
index 205c243..c048d00 100644
--- a/drivers/auth/mbedtls/mbedtls_common.c
+++ b/drivers/auth/mbedtls/mbedtls_common.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -10,6 +10,7 @@
 #include <mbedtls/memory_buffer_alloc.h>
 #include <mbedtls/platform.h>
 #include <mbedtls_config.h>
+#include <mbedtls_common.h>
 
 /*
  * mbed TLS heap