diff --git a/osu.Game/BackgroundBeatmapProcessor.cs b/osu.Game/BackgroundBeatmapProcessor.cs
index 8cc725a3f8..bd3fab9135 100644
--- a/osu.Game/BackgroundBeatmapProcessor.cs
+++ b/osu.Game/BackgroundBeatmapProcessor.cs
@@ -71,7 +71,7 @@ namespace osu.Game
                         {
                             if (b.Ruleset.ShortName == ruleset.ShortName)
                             {
-                                b.StarRating = 0;
+                                b.StarRating = -1;
                                 countReset++;
                             }
                         }
@@ -92,7 +92,7 @@ namespace osu.Game
 
             realmAccess.Run(r =>
             {
-                foreach (var b in r.All<BeatmapInfo>().Where(b => b.StarRating == 0 || (b.OnlineID > 0 && b.LastOnlineUpdate == null)))
+                foreach (var b in r.All<BeatmapInfo>().Where(b => b.StarRating < 0 || (b.OnlineID > 0 && b.LastOnlineUpdate == null)))
                 {
                     Debug.Assert(b.BeatmapSet != null);
                     beatmapSetIds.Add(b.BeatmapSet.ID);
diff --git a/osu.Game/Beatmaps/BeatmapInfo.cs b/osu.Game/Beatmaps/BeatmapInfo.cs
index 3ee306cc9a..466448d771 100644
--- a/osu.Game/Beatmaps/BeatmapInfo.cs
+++ b/osu.Game/Beatmaps/BeatmapInfo.cs
@@ -87,7 +87,11 @@ namespace osu.Game.Beatmaps
 
         public string Hash { get; set; } = string.Empty;
 
-        public double StarRating { get; set; }
+        /// <summary>
+        /// Defaults to -1 (meaning not-yet-calculated).
+        /// Will likely be superseded with a better storage considering ruleset/mods.
+        /// </summary>
+        public double StarRating { get; set; } = -1;
 
         [Indexed]
         public string MD5Hash { get; set; } = string.Empty;
diff --git a/osu.Game/Database/RealmAccess.cs b/osu.Game/Database/RealmAccess.cs
index 7aac94576f..2754696130 100644
--- a/osu.Game/Database/RealmAccess.cs
+++ b/osu.Game/Database/RealmAccess.cs
@@ -63,7 +63,7 @@ namespace osu.Game.Database
         /// 17   2022-07-16    Added CountryCode to RealmUser.
         /// 18   2022-07-19    Added OnlineMD5Hash and LastOnlineUpdate to BeatmapInfo.
         /// 19   2022-07-19    Added DateSubmitted and DateRanked to BeatmapSetInfo.
-        /// 20   2022-07-21    Added LastAppliedDifficultyVersion to RulesetInfo.
+        /// 20   2022-07-21    Added LastAppliedDifficultyVersion to RulesetInfo, changed default value of BeatmapInfo.StarRating to -1.
         /// </summary>
         private const int schema_version = 20;
 
@@ -781,6 +781,16 @@ namespace osu.Game.Database
                 case 14:
                     foreach (var beatmap in migration.NewRealm.All<BeatmapInfo>())
                         beatmap.UserSettings = new BeatmapUserSettings();
+
+                    break;
+
+                case 20:
+                    foreach (var beatmap in migration.NewRealm.All<BeatmapInfo>())
+                    {
+                        if (beatmap.StarRating == 0)
+                            beatmap.StarRating = -1;
+                    }
+
                     break;
             }
         }