diff --git a/sphinx-key/sdkconfig.defaults b/sphinx-key/sdkconfig.defaults
index 32d3e14..2abc603 100644
--- a/sphinx-key/sdkconfig.defaults
+++ b/sphinx-key/sdkconfig.defaults
@@ -22,6 +22,8 @@ CONFIG_MBEDTLS_DYNAMIC_FREE_CA_CERT=y
 CONFIG_SECURE_SIGNED_APPS_NO_SECURE_BOOT=y
 CONFIG_SECURE_BOOT_BUILD_SIGNED_BINARIES=n
 
+CONFIG_MBEDTLS_HARDWARE_AES=n
+
 # All these settings below sum to a 60KB reduction in bin size
 CONFIG_MBEDTLS_HAVE_TIME=n
 CONFIG_MBEDTLS_ECDSA_DETERMINISTIC=n