diff --git a/index.php b/index.php
index 8676ee6..97d3fe0 100644
--- a/index.php
+++ b/index.php
@@ -96,7 +96,7 @@
 			$_COOKIE['email'] = $email;
 		}
 
-		if($captcha != $captcha_answer) {
+		if($captcha != $captcha_answer || empty($captcha_answer)) {
 			if(!empty($img['tmp_name']))
 				@unlink($img['tmp_name']);
 			return 'Invalid CAPTCHA answer, copy the text on the left into the box';