diff --git a/common/mbedtls/config.h b/common/mbedtls/config.h
index dfda7ca40..9f4b19c5e 100644
--- a/common/mbedtls/config.h
+++ b/common/mbedtls/config.h
@@ -489,7 +489,7 @@
  * This option is independent of \c MBEDTLS_AES_FEWER_TABLES.
  *
  */
-//#define MBEDTLS_AES_ROM_TABLES
+#define MBEDTLS_AES_ROM_TABLES
 
 /**
  * \def MBEDTLS_AES_FEWER_TABLES
@@ -511,7 +511,7 @@
  * This option is independent of \c MBEDTLS_AES_ROM_TABLES.
  *
  */
-//#define MBEDTLS_AES_FEWER_TABLES
+#define MBEDTLS_AES_FEWER_TABLES
 
 /**
  * \def MBEDTLS_CAMELLIA_SMALL_MEMORY