diff --git a/src/wp-includes/post.php b/src/wp-includes/post.php
index d879491910..a33236cc7f 100644
--- a/src/wp-includes/post.php
+++ b/src/wp-includes/post.php
@@ -5932,7 +5932,9 @@ function _publish_post_hook( $post_id ) {
 		add_post_meta( $post_id, '_pingme', '1' );
 	add_post_meta( $post_id, '_encloseme', '1' );
 
-	wp_schedule_single_event(time(), 'do_pings');
+	if ( ! wp_next_scheduled( 'do_pings' ) ) {
+		wp_schedule_single_event( time(), 'do_pings' );
+	}
 }
 
 /**