diff --git a/src/lcopteasy.h b/src/lcopteasy.h
index 5c19b86..7f8c17c 100644
--- a/src/lcopteasy.h
+++ b/src/lcopteasy.h
@@ -254,6 +254,12 @@ FLG_ENTRY( SSLVERSION_TLSv1_2 )
 FLG_ENTRY( TLSAUTH_SRP )
 #endif
 
+FLG_ENTRY( HTTP_VERSION_NONE  )
+FLG_ENTRY( HTTP_VERSION_1_0   )
+FLG_ENTRY( HTTP_VERSION_1_1   )
+#if LCURL_CURL_VER_GE(7,33,0)
+FLG_ENTRY( HTTP_VERSION_2_0   )
+#endif
 
 #ifdef OPT_ENTRY_IS_NULL
 #  undef OPT_ENTRY