diff --git a/core/models/ETPostModel.class.php b/core/models/ETPostModel.class.php
index fac7a46..7e448f5 100644
--- a/core/models/ETPostModel.class.php
+++ b/core/models/ETPostModel.class.php
@@ -368,7 +368,7 @@ public function validateContent($content)
 	$content = trim($content);
 
 	// Make sure it's not too long but has at least one character.
-	if (strlen($content) > C("esoTalk.conversation.maxCharsPerPost")) return sprintf(T("message.postTooLong"), C("esoTalk.conversation.maxCharsPerPost"));
+	if (mb_strlen($content) > C("esoTalk.conversation.maxCharsPerPost")) return sprintf(T("message.postTooLong"), C("esoTalk.conversation.maxCharsPerPost"));
 	if (!strlen($content)) return "emptyPost";
 }