Add some missing references

1 files changed, 1 insertions, 1 deletions

diff --git a/src/AvatarProvider.cc b/src/AvatarProvider.cc

index 21253ba7..1c509d0a 100644
--- a/src/AvatarProvider.cc
+++ b/src/AvatarProvider.cc
@@ -36,7 +36,7 @@ AvatarProvider::updateAvatar(const QString &uid, const QImage &img)
                 auto callbacks = toBeResolved_[uid];
 
                 // Update all the timeline items with the resolved avatar.
-                for (const auto callback : callbacks)
+                for (const auto &callback : callbacks)
                         callback(img);
 
                 toBeResolved_.erase(uid);