diff --git a/NzbDrone.Core/Tv/RefreshEpisodeService.cs b/NzbDrone.Core/Tv/RefreshEpisodeService.cs
index 6c2e1c4b0..d48f0182f 100644
--- a/NzbDrone.Core/Tv/RefreshEpisodeService.cs
+++ b/NzbDrone.Core/Tv/RefreshEpisodeService.cs
@@ -132,7 +132,7 @@ namespace NzbDrone.Core.Tv
         {
             var groups =
                 allEpisodes.Where(c => c.AirDateUtc.HasValue)
-                    .GroupBy(e => new { e.SeriesId, e.AirDate })
+                    .GroupBy(e => new { e.SeasonNumber, e.AirDate })
                     .Where(g => g.Count() > 1)
                     .ToList();