1 files changed, 1 insertions, 1 deletions
diff --git a/Swiften/Avatars/AvatarProvider.h b/Swiften/Avatars/AvatarProvider.h
index 5c9460d..3606376 100644
--- a/Swiften/Avatars/AvatarProvider.h
+++ b/Swiften/Avatars/AvatarProvider.h
@@ -1,25 +1,25 @@
 /*
  * Copyright (c) 2010 Remko Tronçon
  * Licensed under the GNU General Public License v3.
  * See Documentation/Licenses/GPLv3.txt for more information.
  */
 
 #pragma once
 
 #include <string>
 
 #include <Swiften/Base/API.h>
 #include <Swiften/Base/boost_bsignals.h>
 
 namespace Swift {
 	class JID;
 
 	class SWIFTEN_API AvatarProvider {
 		public:
 			virtual ~AvatarProvider();
 
-			virtual std::string getAvatarHash(const JID&) const = 0;
+			virtual boost::optional<std::string> getAvatarHash(const JID&) const = 0;
 
 			boost::signal<void (const JID&)> onAvatarChanged;
 	};
 }