diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index d0e61c5..1ae5125 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -3617,7 +3617,7 @@
 
 /* ECP options */
 //#define MBEDTLS_ECP_MAX_BITS             521 /**< Maximum bit size of groups */
-//#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 */