diff --git a/options.h b/options.h
index 77a7c73..a2848a5 100644
--- a/options.h
+++ b/options.h
@@ -112,8 +112,8 @@ much traffic. */
 
 #define DROPBEAR_SHA1_HMAC
 #define DROPBEAR_SHA1_96_HMAC
-#define DROPBEAR_SHA2_256_HMAC
-#define DROPBEAR_SHA2_512_HMAC
+/*#define DROPBEAR_SHA2_256_HMAC*/
+/*#define DROPBEAR_SHA2_512_HMAC*/
 #define DROPBEAR_MD5_HMAC
 
 /* Hostkey/public key algorithms - at least one required, these are used