diff --git a/RomRepoMgr.Blazor/Components/Dialogs/ImportRoms.razor.cs b/RomRepoMgr.Blazor/Components/Dialogs/ImportRoms.razor.cs
index d64e07e..4d64f54 100644
--- a/RomRepoMgr.Blazor/Components/Dialogs/ImportRoms.razor.cs
+++ b/RomRepoMgr.Blazor/Components/Dialogs/ImportRoms.razor.cs
@@ -327,6 +327,9 @@ public partial class ImportRoms : ComponentBase
 
                                      if(!archiveImporter.IsCrcInDb(reader.Entry.Crc) && KnownOnlyChecked) continue;
 
+                                     // Do not import files that are already in the repository
+                                     if(archiveImporter.IsInRepo(reader.Entry.Crc)) continue;
+
                                      var worker = new FileImporter(_ctx,
                                                                    _newFiles,
                                                                    _newDisks,
diff --git a/RomRepoMgr.Core/Workers/FileImporter.cs b/RomRepoMgr.Core/Workers/FileImporter.cs
index e9ab92f..402a0de 100644
--- a/RomRepoMgr.Core/Workers/FileImporter.cs
+++ b/RomRepoMgr.Core/Workers/FileImporter.cs
@@ -556,6 +556,14 @@ public sealed class FileImporter
         }
     }
 
+    public bool IsInRepo(long crc32)
+    {
+        lock(DbLock)
+        {
+            return _ctx.Files.Any(f => f.Crc32 == crc32.ToString("x8") && f.IsInRepo);
+        }
+    }
+
     public void ImportAndHashRom(Stream stream, string filename, string tempPath, long size)
     {
         try
diff --git a/RomRepoMgr/ViewModels/ImportRomFolderViewModel.cs b/RomRepoMgr/ViewModels/ImportRomFolderViewModel.cs
index 8ead91d..b75e0b9 100644
--- a/RomRepoMgr/ViewModels/ImportRomFolderViewModel.cs
+++ b/RomRepoMgr/ViewModels/ImportRomFolderViewModel.cs
@@ -410,6 +410,9 @@ public sealed partial class ImportRomFolderViewModel : ViewModelBase
 
                                      if(!archiveImporter.IsCrcInDb(reader.Entry.Crc) && KnownOnlyChecked) continue;
 
+                                     // Do not import files that are already in the repository
+                                     if(archiveImporter.IsInRepo(reader.Entry.Crc)) continue;
+
                                      var model = new RomImporter
                                      {
                                          Filename      = Path.GetFileName(reader.Entry.Key),