diff -ru typo3_src-4.5.2.orig/typo3/sysext/cms/tslib/class.tslib_pagegen.php typo3_src-4.5.2/typo3/sysext/cms/tslib/class.tslib_pagegen.php
--- typo3_src-4.5.2.orig/typo3/sysext/cms/tslib/class.tslib_pagegen.php	2011-03-23 15:58:58.000000000 +0100
+++ typo3_src-4.5.2/typo3/sysext/cms/tslib/class.tslib_pagegen.php	2011-03-23 16:00:55.000000000 +0100
@@ -821,6 +821,10 @@
 						if (strtolower($key) == 'refresh') {
 							$a = 'http-equiv';
 						}
+						if (isset($conf[$theKey . '.']['force_http-equiv'])) {
+							$a = 'http-equiv';
+						}
+
 						$pageRenderer->addMetaTag('<meta ' . $a . '="' . $key . '" content="' . htmlspecialchars(trim($val)) . '"' . $endingSlash . '>');
 					}
 				}