diff --git a/backend/app/cmd/server.go b/backend/app/cmd/server.go
index 9dab9ef1..f17dab26 100644
--- a/backend/app/cmd/server.go
+++ b/backend/app/cmd/server.go
@@ -79,7 +79,7 @@ type ServerCommand struct {
 	EnableEmoji      bool          `long:"emoji" env:"EMOJI" description:"enable emoji"`
 	SimpleView       bool          `long:"simple-view" env:"SIMPLE_VIEW" description:"minimal comment editor mode"`
 	ProxyCORS        bool          `long:"proxy-cors" env:"PROXY_CORS" description:"disable internal CORS and delegate it to proxy"`
-	AllowedHosts     []string      `long:"allowed-hosts" env:"ALLOWED_HOSTS" description:"limit hosts/sources allowed to embed comments"`
+	AllowedHosts     []string      `long:"allowed-hosts" env:"ALLOWED_HOSTS" description:"limit hosts/sources allowed to embed comments" env-delim:","`
 	SubscribersOnly  bool          `long:"subscribers-only" env:"SUBSCRIBERS_ONLY" description:"enable commenting only for Patreon subscribers"`
 	DisableSignature bool          `long:"disable-signature" env:"DISABLE_SIGNATURE" description:"disable server signature in headers"`