diff --git a/wp-includes/js/tinymce/tiny_mce_gzip.php b/wp-includes/js/tinymce/tiny_mce_gzip.php
index 9755169fdb..0955bc207f 100644
--- a/wp-includes/js/tinymce/tiny_mce_gzip.php
+++ b/wp-includes/js/tinymce/tiny_mce_gzip.php
@@ -22,8 +22,6 @@
 		if ( ! function_exists('__') ) {
 			return $text;
 		} else {
-			header('Content-Type: text/plain');
-
 			$search1 = "/^tinyMCELang\\[(['\"])(.*)\\1\]( ?= ?)(['\"])(.*)\\4/uem";
 			$replace1 = "'tinyMCELang[\\1\\2\\1]\\3'.stripslashes('\\4').__('\\5').stripslashes('\\4')";