diff --git a/osu.Game/Beatmaps/BeatmapManager.cs b/osu.Game/Beatmaps/BeatmapManager.cs
index b7bece9492..abc0351a82 100644
--- a/osu.Game/Beatmaps/BeatmapManager.cs
+++ b/osu.Game/Beatmaps/BeatmapManager.cs
@@ -81,7 +81,7 @@ namespace osu.Game.Beatmaps
 
         protected override void Populate(BeatmapSetInfo model, ArchiveReader archive)
         {
-            model.Beatmaps = createBeatmapDifficulties(archive);
+            model.Beatmaps = createBeatmapDifficulties(model, archive);
 
             // remove metadata from difficulties where it matches the set
             foreach (BeatmapInfo b in model.Beatmaps)
@@ -322,7 +322,7 @@ namespace osu.Game.Beatmaps
         /// <summary>
         /// Create all required <see cref="BeatmapInfo"/>s for the provided archive.
         /// </summary>
-        private List<BeatmapInfo> createBeatmapDifficulties(ArchiveReader reader)
+        private List<BeatmapInfo> createBeatmapDifficulties(BeatmapSetInfo model, ArchiveReader reader)
         {
             var beatmapInfos = new List<BeatmapInfo>();
 
@@ -342,6 +342,14 @@ namespace osu.Game.Beatmaps
                     beatmap.BeatmapInfo.Hash = ms.ComputeSHA2Hash();
                     beatmap.BeatmapInfo.MD5Hash = ms.ComputeMD5Hash();
 
+                    // ensure we have the same online set ID as the set itself.
+                    beatmap.BeatmapInfo.OnlineBeatmapSetID = model.OnlineBeatmapSetID;
+                    beatmap.BeatmapInfo.Metadata.OnlineBeatmapSetID = model.OnlineBeatmapSetID;
+
+                    // check that no existing beatmap exists that is imported with the same online beatmap ID. if so, give it precedence.
+                    if (beatmap.BeatmapInfo.OnlineBeatmapID.HasValue && QueryBeatmap(b => b.OnlineBeatmapID.Value == beatmap.BeatmapInfo.OnlineBeatmapID.Value) != null)
+                        beatmap.BeatmapInfo.OnlineBeatmapID = null;
+
                     RulesetInfo ruleset = rulesets.GetRuleset(beatmap.BeatmapInfo.RulesetID);
 
                     beatmap.BeatmapInfo.Ruleset = ruleset;