diff --git a/wrapper/CSharp/user_settings.h b/wrapper/CSharp/user_settings.h
index 21a72a69b..ce37a599d 100644
--- a/wrapper/CSharp/user_settings.h
+++ b/wrapper/CSharp/user_settings.h
@@ -45,6 +45,7 @@
 #define WOLFSSL_KEY_GEN /* RSA key gen */
 #define WOLFSSL_ASN_TEMPLATE /* default */
 #define WOLFSSL_SHA3
+#define HAVE_SNI
 
 #if 0
     #define OPENSSL_EXTRA