diff --git a/src/CortexPE/DiscordWebhookAPI/Message.php b/src/CortexPE/DiscordWebhookAPI/Message.php
index f2c66f1..8f522e2 100644
--- a/src/CortexPE/DiscordWebhookAPI/Message.php
+++ b/src/CortexPE/DiscordWebhookAPI/Message.php
@@ -67,7 +67,7 @@ public function setTextToSpeech(bool $ttsEnabled):void{
 		$this->data["tts"] = $ttsEnabled;
 	}
 
-	public function jsonSerialize(){
+	public function jsonSerialize(): mixed{
 		return $this->data;
 	}
 }