Index: Slim/Buttons/Synchronize.pm
===================================================================
--- Slim/Buttons/Synchronize.pm	(revision 15934)
+++ Slim/Buttons/Synchronize.pm	(working copy)
@@ -142,7 +142,7 @@
 		if (Slim::Player::Sync::isSyncedWith($client, $selectedClient) || ($client eq $selectedClient)) {
 			$client->execute( [ 'sync', '-' ] );
 		} else {
-			$client->execute( [ 'sync', $selectedClient->id ] );
+			$selectedClient->execute( [ 'sync', $client->id ] );
 		}
 
 		$client->pushLeft(\@oldlines, $client->curLines());
Index: Slim/Web/Settings/Player/Audio.pm
===================================================================
--- Slim/Web/Settings/Player/Audio.pm	(revision 15934)
+++ Slim/Web/Settings/Player/Audio.pm	(working copy)
@@ -90,7 +90,7 @@
 			if ($pref eq 'synchronize') {
 			
 				if (my $otherClient = Slim::Player::Client::getClient($paramRef->{$pref})) {
-					$client->execute( [ 'sync', $otherClient->id ] );
+					$otherClient->execute( [ 'sync', $client->id ] );
 				} else {
 					$client->execute( [ 'sync', '-' ] );
 				}