diff --git a/osu.Game/Database/IModelFileManager.cs b/osu.Game/Database/IModelFileManager.cs
index 4bc1e2d29b..390be4a69d 100644
--- a/osu.Game/Database/IModelFileManager.cs
+++ b/osu.Game/Database/IModelFileManager.cs
@@ -25,7 +25,7 @@ namespace osu.Game.Database
         void DeleteFile(TModel model, TFileModel file);
 
         /// <summary>
-        /// Add a new file.
+        /// Add a new file. If the file already exists, it is overwritten.
         /// </summary>
         /// <param name="model">The item to operate on.</param>
         /// <param name="contents">The new file contents.</param>
diff --git a/osu.Game/Stores/RealmArchiveModelManager.cs b/osu.Game/Stores/RealmArchiveModelManager.cs
index a916e2b53a..4efcdd096c 100644
--- a/osu.Game/Stores/RealmArchiveModelManager.cs
+++ b/osu.Game/Stores/RealmArchiveModelManager.cs
@@ -74,10 +74,18 @@ namespace osu.Game.Stores
         }
 
         /// <summary>
-        /// Add a file from within an ongoing realm transaction.
+        /// Add a file from within an ongoing realm transaction. If the file already exists, it is overwritten.
         /// </summary>
         protected void AddFile(TModel item, Stream stream, string filename, Realm realm)
         {
+            var existing = item.Files.FirstOrDefault(f => string.Equals(f.Filename, filename, StringComparison.OrdinalIgnoreCase));
+
+            if (existing != null)
+            {
+                ReplaceFile(item, existing, stream, realm);
+                return;
+            }
+
             var file = realmFileStore.Add(stream, realm);
             var namedUsage = new RealmNamedFileUsage(file, filename);