diff --git a/commands/hugo.go b/commands/hugo.go
index f363cc7a012..83dae0d118d 100644
--- a/commands/hugo.go
+++ b/commands/hugo.go
@@ -467,6 +467,8 @@ func watchConfig() {
 	viper.WatchConfig()
 	viper.OnConfigChange(func(e fsnotify.Event) {
 		fmt.Println("Config file changed:", e.Name)
+		// Force a full rebuild
+		MainSite = nil
 		utils.CheckErr(buildSite(true))
 		if !viper.GetBool("DisableLiveReload") {
 			// Will block forever trying to write to a channel that nobody is reading if livereload isn't initialized