diff --git a/wp-includes/post.php b/wp-includes/post.php
index d49dd54e11..126c5a9925 100644
--- a/wp-includes/post.php
+++ b/wp-includes/post.php
@@ -4143,7 +4143,7 @@ function _transition_post_status($new_status, $old_status, $post) {
  */
 function _future_post_hook( $deprecated = '', $post ) {
 	wp_clear_scheduled_hook( 'publish_future_post', array( $post->ID ) );
-	wp_schedule_single_event( get_gmt_from_date( $post->post_date ) . ' GMT', 'publish_future_post', array( $post->ID ) );
+	wp_schedule_single_event( strtotime( get_gmt_from_date( $post->post_date ) . ' GMT') , 'publish_future_post', array( $post->ID ) );
 }
 
 /**