diff --git a/administrator/components/com_jedchecker/libraries/rules/language.php b/administrator/components/com_jedchecker/libraries/rules/language.php
index f2f6623..2e3260a 100644
--- a/administrator/components/com_jedchecker/libraries/rules/language.php
+++ b/administrator/components/com_jedchecker/libraries/rules/language.php
@@ -402,7 +402,7 @@ class JedcheckerRulesLanguage extends JEDcheckerRule
 		// Check all keys exist in INI files
 		foreach ($matches[2] as $match)
 		{
-			$key = $match[0];
+			$key = strtoupper($match[0]);
 
 			if (!isset($this->langKeys[$key]))
 			{