diff --git a/src/wp-mail.php b/src/wp-mail.php
index 07820e6b0c..62c9a11903 100644
--- a/src/wp-mail.php
+++ b/src/wp-mail.php
@@ -66,7 +66,6 @@ for ( $i = 1; $i <= $count; $i++ ) {
 	$content_transfer_encoding = '';
 	$post_author = 1;
 	$author_found = false;
-	$dmonths = array('Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec');
 	foreach ($message as $line) {
 		// Body signal.
 		if ( strlen($line) < 3 )