diff --git a/scripts/config.pl b/scripts/config.pl
index 0a65ef4..fce7366 100755
--- a/scripts/config.pl
+++ b/scripts/config.pl
@@ -60,6 +60,7 @@
 #   MBEDTLS_SSL_TRANSFORM_OPTIMIZE_CIPHERS
 #   MBEDTLS_VALIDATE_SSL_KEYS_INTEGRITY
 #   MBEDTLS_OPTIMIZE_TINYCRYPT_ASM
+#   MBEDTLS_AES_128_BIT_MASKED
 #   and any symbol beginning _ALT
 #
 # The baremetal configuration excludes options that require a library or
@@ -146,6 +147,7 @@
 MBEDTLS_SSL_TRANSFORM_OPTIMIZE_CIPHERS
 MBEDTLS_VALIDATE_SSL_KEYS_INTEGRITY
 MBEDTLS_OPTIMIZE_TINYCRYPT_ASM
+MBEDTLS_AES_128_BIT_MASKED
 _ALT\s*$
 );