diff -Nrup a/src/jsonrpccpp/server/connectors/httpserver.cpp b/src/jsonrpccpp/server/connectors/httpserver.cpp
--- a/src/jsonrpccpp/server/connectors/httpserver.cpp	2020-01-13 22:48:30.000000000 +0100
+++ b/src/jsonrpccpp/server/connectors/httpserver.cpp	2020-07-26 18:42:23.148244386 +0200
@@ -14,6 +14,10 @@
 #include <jsonrpccpp/common/specificationparser.h>
 #include <sstream>
 
+#if MHD_VERSION < 0x00097002
+typedef int MHD_Result;
+#endif
+
 using namespace jsonrpc;
 using namespace std;
 
@@ -55,7 +59,7 @@ bool HttpServer::StartListening() {
         (MHD_is_feature_supported(MHD_FEATURE_EPOLL) == MHD_YES);
     const bool has_poll =
         (MHD_is_feature_supported(MHD_FEATURE_POLL) == MHD_YES);
-    unsigned int mhd_flags = MHD_USE_DUAL_STACK;
+    MHD_FLAG mhd_flags = MHD_USE_DUAL_STACK;
 
     if (has_epoll)
 // In MHD version 0.9.44 the flag is renamed to
@@ -121,8 +125,8 @@ bool HttpServer::SendResponse(const stri
   MHD_add_response_header(result, "Content-Type", "application/json");
   MHD_add_response_header(result, "Access-Control-Allow-Origin", "*");
 
-  int ret = MHD_queue_response(client_connection->connection,
-                               client_connection->code, result);
+  MHD_Result ret = MHD_queue_response(client_connection->connection,
+                                      client_connection->code, result);
   MHD_destroy_response(result);
   return ret == MHD_YES;
 }
@@ -139,8 +143,8 @@ bool HttpServer::SendOptionsResponse(voi
                           "origin, content-type, accept");
   MHD_add_response_header(result, "DAV", "1");
 
-  int ret = MHD_queue_response(client_connection->connection,
-                               client_connection->code, result);
+  MHD_Result ret = MHD_queue_response(client_connection->connection,
+                                      client_connection->code, result);
   MHD_destroy_response(result);
   return ret == MHD_YES;
 }
@@ -151,10 +155,10 @@ void HttpServer::SetUrlHandler(const str
   this->SetHandler(NULL);
 }
 
-int HttpServer::callback(void *cls, MHD_Connection *connection, const char *url,
-                         const char *method, const char *version,
-                         const char *upload_data, size_t *upload_data_size,
-                         void **con_cls) {
+MHD_Result HttpServer::callback(void *cls, MHD_Connection *connection, const char *url,
+                                const char *method, const char *version,
+                                const char *upload_data, size_t *upload_data_size,
+                                void **con_cls) {
   (void)version;
   if (*con_cls == NULL) {
     struct mhd_coninfo *client_connection = new mhd_coninfo;
diff --git a/src/jsonrpccpp/server/connectors/httpserver.h b/src/jsonrpccpp/server/connectors/httpserver.h
index 7785edb..74cce4f 100644
--- a/src/jsonrpccpp/server/connectors/httpserver.h
+++ b/src/jsonrpccpp/server/connectors/httpserver.h
@@ -79,7 +79,7 @@ private:
   std::map<std::string, IClientConnectionHandler *> urlhandler;
   struct sockaddr_in loopback_addr;
 
-  static int callback(void *cls, struct MHD_Connection *connection,
+  static MHD_Result callback(void *cls, struct MHD_Connection *connection,
                       const char *url, const char *method, const char *version,
                       const char *upload_data, size_t *upload_data_size,
                       void **con_cls);
diff --git a/src/test/testhttpserver.h b/src/test/testhttpserver.h
index f438c64..ef7429b 100644
--- a/src/test/testhttpserver.h
+++ b/src/test/testhttpserver.h
@@ -36,7 +36,7 @@ namespace jsonrpc {
             std::map<std::string,std::string> headers;
             std::string response;
 
-            static int callback(void *cls, struct MHD_Connection *connection, const char *url, const char *method, const char *version, const char *upload_data, size_t *upload_data_size, void **con_cls);
+            static MHD_Result callback(void *cls, struct MHD_Connection *connection, const char *url, const char *method, const char *version, const char *upload_data, size_t *upload_data_size, void **con_cls);
 
             static int header_iterator (void *cls, enum MHD_ValueKind kind, const char *key, const char *value);
     };