diff --git a/src/shrpx_ssl.cc b/src/shrpx_ssl.cc
index d1952acb..a53c6493 100644
--- a/src/shrpx_ssl.cc
+++ b/src/shrpx_ssl.cc
@@ -269,9 +269,12 @@ SSL_CTX* create_ssl_context(const char *private_key_file,
 
 #ifndef OPENSSL_NO_EC
 
-#if OPENSSL_VERSION_NUMBER >= 0x10002000L
-  SSL_CTX_set_ecdh_auto(ssl_ctx, 1);
-#else // OPENSSL_VERSION_NUBMER < 0x10002000L
+  // Disabled SSL_CTX_set_ecdh_auto, because computational cost of
+  // chosen curve is much higher than P-256.
+
+// #if OPENSSL_VERSION_NUMBER >= 0x10002000L
+//   SSL_CTX_set_ecdh_auto(ssl_ctx, 1);
+// #else // OPENSSL_VERSION_NUBMER < 0x10002000L
   // Use P-256, which is sufficiently secure at the time of this
   // writing.
   auto ecdh = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
@@ -282,7 +285,7 @@ SSL_CTX* create_ssl_context(const char *private_key_file,
   }
   SSL_CTX_set_tmp_ecdh(ssl_ctx, ecdh);
   EC_KEY_free(ecdh);
-#endif // OPENSSL_VERSION_NUBMER < 0x10002000L
+// #endif // OPENSSL_VERSION_NUBMER < 0x10002000L
 
 #endif // OPENSSL_NO_EC