1 files changed, 2 insertions, 2 deletions
diff --git a/Swiften/Avatars/CombinedAvatarProvider.h b/Swiften/Avatars/CombinedAvatarProvider.h
index 96989b2..ec06e72 100644
--- a/Swiften/Avatars/CombinedAvatarProvider.h
+++ b/Swiften/Avatars/CombinedAvatarProvider.h
@@ -1,32 +1,32 @@
 /*
  * Copyright (c) 2010 Remko Tronçon
  * Licensed under the GNU General Public License v3.
  * See Documentation/Licenses/GPLv3.txt for more information.
  */
 
 #pragma once
 
 #include <vector>
 #include <map>
 
 #include <Swiften/Base/API.h>
 #include <Swiften/Avatars/AvatarProvider.h>
 #include <Swiften/JID/JID.h>
 
 namespace Swift {
 	class SWIFTEN_API CombinedAvatarProvider : public AvatarProvider {
 		public:
-			virtual std::string getAvatarHash(const JID&) const;
+			virtual boost::optional<std::string> getAvatarHash(const JID&) const;
 
 			void addProvider(AvatarProvider*);
 			void removeProvider(AvatarProvider*);
 
 		private:
 			void handleAvatarChanged(const JID&);
-			std::string getCombinedAvatarAndCache(const JID&) const;
+			boost::optional<std::string> getCombinedAvatarAndCache(const JID&) const;
 
 		private:
 			std::vector<AvatarProvider*> providers;
 			mutable std::map<JID, std::string> avatars;
 	};
 }