diff --git a/wp-includes/js/tinymce/tiny_mce_config.php b/wp-includes/js/tinymce/tiny_mce_config.php
index ef3c7c480d..47e4191ec9 100644
--- a/wp-includes/js/tinymce/tiny_mce_config.php
+++ b/wp-includes/js/tinymce/tiny_mce_config.php
@@ -256,8 +256,6 @@ if ( $disk_cache && is_file($cache_file) && is_readable($cache_file) ) {
 	if ( '.gz' == $cache_ext )
 		header( 'Content-Encoding: gzip' );
 
-	header( 'Content-Length: ' . strlen($content) );
-
 	echo $content;
 	exit;
 }
@@ -301,7 +299,6 @@ if ( '.gz' == $cache_ext ) {
 }
 
 // Stream to client
-header( 'Content-Length: ' . strlen($content) );
 echo $content;
 
 // Write file
@@ -326,4 +323,4 @@ if ( '' != $cacheKey && is_dir($cache_path) && is_readable($cache_path) ) {
 	putFileContents( $cache_file, $content );
 }
 
-?>
+?>
\ No newline at end of file