diff --git a/qrcode.js b/qrcode.js
index 5507c154..8e907892 100644
--- a/qrcode.js
+++ b/qrcode.js
@@ -504,7 +504,7 @@ var QRCode;
 
 	function _getUTF8Length(sText) {
 		var replacedText = encodeURI(sText).toString().replace(/\%[0-9a-fA-F]{2}/g, 'a');
-		return replacedText.length + (replacedText.length != sText ? 3 : 0);
+		return replacedText.length + (replacedText.length != sText.length ? 3 : 0);
 	}
 	
 	/**