diff --git a/server/tilerendererjob/incremental.go b/server/tilerendererjob/incremental.go
index ddc3e74..95a3c75 100644
--- a/server/tilerendererjob/incremental.go
+++ b/server/tilerendererjob/incremental.go
@@ -49,7 +49,7 @@ func incrementalRender(ctx *app.App) {
 
 		ctx.WebEventbus.Emit("incremental-render-progress", &ev)
 
-		millisDiff := (time.Now().Unix() * 1000) - result.LastMtime
+		millisDiff := time.Now().Unix() - result.LastMtime
 
 		fields := logrus.Fields{
 			"mapblocks":   len(result.List),
diff --git a/server/tilerendererjob/job.go b/server/tilerendererjob/job.go
index 58b3e37..0532708 100644
--- a/server/tilerendererjob/job.go
+++ b/server/tilerendererjob/job.go
@@ -10,7 +10,7 @@ func Job(ctx *app.App) {
 	lastMtime := ctx.Settings.GetInt64(settings.SETTING_LAST_MTIME, 0)
 	if lastMtime == 0 {
 		//mark current time as last incremental render point
-		ctx.Settings.SetInt64(settings.SETTING_LAST_MTIME, time.Now().Unix()*1000)
+		ctx.Settings.SetInt64(settings.SETTING_LAST_MTIME, time.Now().Unix())
 	}
 
 	if ctx.Config.EnableInitialRendering {