diff --git a/third_party/mbedtls/mbedtls-config.h b/third_party/mbedtls/mbedtls-config.h
index 9623c553c..817ce137c 100644
--- a/third_party/mbedtls/mbedtls-config.h
+++ b/third_party/mbedtls/mbedtls-config.h
@@ -891,7 +891,7 @@
  *
  * Uncomment to enable the smaller implementation of SHA256.
  */
-//#define MBEDTLS_SHA256_SMALLER
+#define MBEDTLS_SHA256_SMALLER
 
 /**
  * \def MBEDTLS_SSL_AEAD_RANDOM_IV