Index: src/wp-includes/option.php
===================================================================
--- src/wp-includes/option.php	(revision 34868)
+++ src/wp-includes/option.php	(working copy)
@@ -706,7 +706,7 @@
 	 * @param int    $expiration Time until expiration in seconds.
 	 * @param string $transient  Transient name.
 	 */
-	$expiration = apply_filters( 'expiration_pre_set_transient_' . $transient, $expiration, $value, $transient );
+	$expiration = apply_filters( 'pre_set_transient_' . $transient . '_expiration', $expiration, $value, $transient );
 
 	if ( wp_using_ext_object_cache() ) {
 		$result = wp_cache_set( $transient, $value, 'transient', $expiration );
@@ -1613,7 +1613,7 @@
 	 * @param int    $expiration Time until expiration in seconds.
 	 * @param string $transient  Transient name.
 	 */
-	$expiration = apply_filters( 'expiration_pre_set_site_transient_' . $transient, $expiration, $value, $transient );	
+	$expiration = apply_filters( 'pre_set_site_transient_' . $transient . '_expiration', $expiration, $value, $transient );	
 
 	if ( wp_using_ext_object_cache() ) {
 		$result = wp_cache_set( $transient, $value, 'site-transient', $expiration );