diff --git a/socketserver/server/handlecore.go b/socketserver/server/handlecore.go
index 451b9223..49d73c53 100644
--- a/socketserver/server/handlecore.go
+++ b/socketserver/server/handlecore.go
@@ -88,6 +88,7 @@ func SetupServerAndHandle(config *ConfigFile, serveMux *http.ServeMux) {
 	serveMux.Handle("/.well-known/", http.FileServer(http.Dir("/tmp/letsencrypt/")))
 	serveMux.HandleFunc("/stats", HTTPShowStatistics)
 	serveMux.HandleFunc("/hll/", HTTPShowHLL)
+	serveMux.HandleFunc("/hll_force_write", HTTPWriteHLL)
 
 	serveMux.HandleFunc("/drop_backlog", HTTPBackendDropBacklog)
 	serveMux.HandleFunc("/uncached_pub", HTTPBackendUncachedPublish)
diff --git a/socketserver/server/usercount.go b/socketserver/server/usercount.go
index 9ac614fa..44ad68e3 100644
--- a/socketserver/server/usercount.go
+++ b/socketserver/server/usercount.go
@@ -164,6 +164,12 @@ func HTTPShowHLL(w http.ResponseWriter, r *http.Request) {
 	hllFileServer.ServeHTTP(w, r)
 }
 
+func HTTPWriteHLL(w http.ResponseWriter, r *http.Request) {
+	writeAllHLLs()
+	w.WriteHeader(200)
+	w.Write([]byte("ok"))
+}
+
 // loadUniqueUsers loads the previous HLLs into memory.
 // is_init_func
 func loadUniqueUsers() {