diff --git a/mongoose.c b/mongoose.c
index 9571d574..22da9a51 100644
--- a/mongoose.c
+++ b/mongoose.c
@@ -6590,6 +6590,7 @@ void mg_http_handler(struct mg_connection *nc, int ev,
       struct mg_http_multipart_part mp;
       memset(&mp, 0, sizeof(mp));
       mp.status = -1;
+      mp.user_data = pd->mp_stream.user_data;
       mp.var_name = pd->mp_stream.var_name;
       mp.file_name = pd->mp_stream.file_name;
       mg_call(nc, (pd->endpoint_handler ? pd->endpoint_handler : nc->handler),
diff --git a/src/mg_http.c b/src/mg_http.c
index ef546c37..9e9d761c 100644
--- a/src/mg_http.c
+++ b/src/mg_http.c
@@ -756,6 +756,7 @@ void mg_http_handler(struct mg_connection *nc, int ev,
       struct mg_http_multipart_part mp;
       memset(&mp, 0, sizeof(mp));
       mp.status = -1;
+      mp.user_data = pd->mp_stream.user_data;
       mp.var_name = pd->mp_stream.var_name;
       mp.file_name = pd->mp_stream.file_name;
       mg_call(nc, (pd->endpoint_handler ? pd->endpoint_handler : nc->handler),