diff --git a/JlSonic/api.jl b/JlSonic/api.jl
index b030da9..d28060f 100644
--- a/JlSonic/api.jl
+++ b/JlSonic/api.jl
@@ -93,7 +93,7 @@ function getArtists()
     artists = unique(beetsdb)
     # albums = group_albums_as_artists()
     # .|> does not work in a macro. What to do?
-    for index in unique(first.(filter(isempty,
+    for index in unique(first.(filter(!isempty,
                                       getfield.(artists, Ref(:name)))) .|> uppercase)
         indexXML = new_child(indexes, "index")
         set_attribute(indexXML, "name", string(index))