diff --git a/modules/spamfilter/spamfilter.model.php b/modules/spamfilter/spamfilter.model.php
index c747fb00d..0e2c3823f 100644
--- a/modules/spamfilter/spamfilter.model.php
+++ b/modules/spamfilter/spamfilter.model.php
@@ -80,11 +80,11 @@ class spamfilterModel extends spamfilter
 		$word_list = $this->getDeniedWordList();
 		if(!count($word_list)) return new BaseObject();
 
-		$text = utf8_trim(utf8_normalize_spaces(htmlspecialchars_decode(strip_tags($text, '<a><img>'))));
+		$text = strtolower(utf8_trim(utf8_normalize_spaces(htmlspecialchars_decode(strip_tags($text, '<a><img>')))));
 		foreach ($word_list as $word_item)
 		{
 			$word = $word_item->word;
-			if (strpos($text, $word) !== false)
+			if (strpos($text, strtolower($word)) !== false)
 			{
 				$args = new stdClass();
 				$args->word = $word;