diff --git a/webapp/service.c b/webapp/service.c
index 4b3aea6..b13b863 100644
--- a/webapp/service.c
+++ b/webapp/service.c
@@ -44,7 +44,7 @@
     "  </body>\n"\
     "</html>\n"
 
-static int ahc_echo(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 **ptr)
+static enum MHD_Result ahc_echo(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 **ptr)
 {
     static int dummy;
     const char *page = cls;