diff --git a/gateway/httpgateway.h b/gateway/httpgateway.h
index b96b82b..448f8c7 100644
--- a/gateway/httpgateway.h
+++ b/gateway/httpgateway.h
@@ -1,5 +1,8 @@
 #ifndef HTTPGATEWAY_H
 #define HTTPGATEWAY_H
+
+#define CPPHTTPLIB_FORM_URL_ENCODED_PAYLOAD_MAX_LENGTH 65536
+
 #include <httplib.h>
 #include "gatewayinterface.h"
 #include "../requestworker.h"