diff --git a/osu.Game/Beatmaps/Formats/Decoder.cs b/osu.Game/Beatmaps/Formats/Decoder.cs
index 46a1ed1967..845ac20db0 100644
--- a/osu.Game/Beatmaps/Formats/Decoder.cs
+++ b/osu.Game/Beatmaps/Formats/Decoder.cs
@@ -63,7 +63,7 @@ namespace osu.Game.Beatmaps.Formats
             if (line == null)
                 throw new IOException("Unknown file format (null)");
 
-            var decoder = typedDecoders.Where(d => line.StartsWith(d.Key, StringComparison.InvariantCulture)).FirstOrDefault().Value;
+            var decoder = typedDecoders.Where(d => line.StartsWith(d.Key, StringComparison.InvariantCulture)).Select(d => d.Value).FirstOrDefault();
 
             // it's important the magic does NOT get consumed here, since sometimes it's part of the structure
             // (see JsonBeatmapDecoder - the magic string is the opening brace)