diff --git a/include/picotls.h b/include/picotls.h
index e5e03a6..14a3b46 100644
--- a/include/picotls.h
+++ b/include/picotls.h
@@ -171,12 +171,6 @@
 #define PTLS_HPKE_AEAD_AES_256_GCM 2
 #define PTLS_HPKE_AEAD_CHACHA20POLY1305 3
 
-/* ESNI */
-#define PTLS_ESNI_VERSION_DRAFT03 0xff02
-
-#define PTLS_ESNI_RESPONSE_TYPE_ACCEPT 0
-#define PTLS_ESNI_RESPONSE_TYPE_RETRY_REQUEST 1
-
 /* error classes and macros */
 #define PTLS_ERROR_CLASS_SELF_ALERT 0
 #define PTLS_ERROR_CLASS_PEER_ALERT 0x100
@@ -234,7 +228,6 @@
 #define PTLS_ERROR_STATELESS_RETRY (PTLS_ERROR_CLASS_INTERNAL + 6)
 #define PTLS_ERROR_NOT_AVAILABLE (PTLS_ERROR_CLASS_INTERNAL + 7)
 #define PTLS_ERROR_COMPRESSION_FAILURE (PTLS_ERROR_CLASS_INTERNAL + 8)
-#define PTLS_ERROR_ESNI_RETRY (PTLS_ERROR_CLASS_INTERNAL + 8)
 #define PTLS_ERROR_REJECT_EARLY_DATA (PTLS_ERROR_CLASS_INTERNAL + 9)
 #define PTLS_ERROR_DELEGATE (PTLS_ERROR_CLASS_INTERNAL + 10)