diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index fc10f9d..0c7e4ec 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -3145,7 +3145,7 @@
 //#define MBEDTLS_HMAC_DRBG_MAX_SEED_INPUT      384 /**< Maximum size of (re)seed buffer */
 
 /* ECP options */
-//#define MBEDTLS_ECP_WINDOW_SIZE            6 /**< Maximum window size used */
+//#define MBEDTLS_ECP_WINDOW_SIZE            4 /**< Maximum window size used */
 //#define MBEDTLS_ECP_FIXED_POINT_OPTIM      1 /**< Enable fixed-point speed-up */
 
 /* Entropy options */