diff --git a/src/NzbDrone.Core.Test/MediaFiles/TrackImport/Specifications/SameFileSpecificationFixture.cs b/src/NzbDrone.Core.Test/MediaFiles/TrackImport/Specifications/SameFileSpecificationFixture.cs
new file mode 100644
index 000000000..073ce9cd5
--- /dev/null
+++ b/src/NzbDrone.Core.Test/MediaFiles/TrackImport/Specifications/SameFileSpecificationFixture.cs
@@ -0,0 +1,96 @@
+using System.Linq;
+using FizzWare.NBuilder;
+using FluentAssertions;
+using Marr.Data;
+using NUnit.Framework;
+using NzbDrone.Core.MediaFiles;
+using NzbDrone.Core.MediaFiles.TrackImport.Specifications;
+using NzbDrone.Core.Parser.Model;
+using NzbDrone.Core.Test.Framework;
+using NzbDrone.Core.Music;
+
+namespace NzbDrone.Core.Test.MediaFiles.TrackImport.Specifications
+{
+    [TestFixture]
+    public class SameFileSpecificationFixture : CoreTest<SameFileSpecification>
+    {
+        private LocalTrack _localTrack;
+
+        [SetUp]
+        public void Setup()
+        {
+            _localTrack = Builder<LocalTrack>.CreateNew()
+                                                 .With(l => l.Size = 150.Megabytes())
+                                                 .Build();
+        }
+
+        [Test]
+        public void should_be_accepted_if_no_existing_file()
+        {
+            _localTrack.Tracks = Builder<Track>.CreateListOfSize(1)
+                                                     .TheFirst(1)
+                                                     .With(e => e.TrackFileId = 0)
+                                                     .BuildList();
+
+            Subject.IsSatisfiedBy(_localTrack).Accepted.Should().BeTrue();
+        }
+
+        [Test]
+        public void should_be_accepted_if_multiple_existing_files()
+        {
+            _localTrack.Tracks = Builder<Track>.CreateListOfSize(2)
+                                                     .TheFirst(1)
+                                                     .With(e => e.TrackFileId = 1)
+                                                     .With(e => e.TrackFile = new LazyLoaded<TrackFile>(
+                                                                                new TrackFile
+                                                                                {
+                                                                                    Size = _localTrack.Size
+                                                                                }))
+                                                     .TheNext(1)
+                                                     .With(e => e.TrackFileId = 2)
+                                                     .With(e => e.TrackFile = new LazyLoaded<TrackFile>(
+                                                                                new TrackFile
+                                                                                {
+                                                                                    Size = _localTrack.Size
+                                                                                }))
+                                                     .Build()
+                                                     .ToList();
+
+            Subject.IsSatisfiedBy(_localTrack).Accepted.Should().BeTrue();
+        }
+
+        [Test]
+        public void should_be_accepted_if_file_size_is_different()
+        {
+            _localTrack.Tracks = Builder<Track>.CreateListOfSize(1)
+                                                     .TheFirst(1)
+                                                     .With(e => e.TrackFileId = 1)
+                                                     .With(e => e.TrackFile = new LazyLoaded<TrackFile>(
+                                                                                new TrackFile
+                                                                                {
+                                                                                    Size = _localTrack.Size + 100.Megabytes()
+                                                                                }))
+                                                     .Build()
+                                                     .ToList();
+
+            Subject.IsSatisfiedBy(_localTrack).Accepted.Should().BeTrue();
+        }
+
+        [Test]
+        public void should_be_reject_if_file_size_is_the_same()
+        {
+            _localTrack.Tracks = Builder<Track>.CreateListOfSize(1)
+                                                     .TheFirst(1)
+                                                     .With(e => e.TrackFileId = 1)
+                                                     .With(e => e.TrackFile = new LazyLoaded<TrackFile>(
+                                                                                new TrackFile
+                                                                                {
+                                                                                    Size = _localTrack.Size
+                                                                                }))
+                                                     .Build()
+                                                     .ToList();
+
+            Subject.IsSatisfiedBy(_localTrack).Accepted.Should().BeFalse();
+        }
+    }
+}
diff --git a/src/NzbDrone.Core.Test/NzbDrone.Core.Test.csproj b/src/NzbDrone.Core.Test/NzbDrone.Core.Test.csproj
index d5a0c106e..a65554526 100644
--- a/src/NzbDrone.Core.Test/NzbDrone.Core.Test.csproj
+++ b/src/NzbDrone.Core.Test/NzbDrone.Core.Test.csproj
@@ -254,6 +254,7 @@
     <Compile Include="MediaFiles\TrackImport\ImportDecisionMakerFixture.cs" />
     <Compile Include="MediaFiles\TrackImport\Specifications\FreeSpaceSpecificationFixture.cs" />
     <Compile Include="MediaFiles\TrackImport\Specifications\NotUnpackingSpecificationFixture.cs" />
+    <Compile Include="MediaFiles\TrackImport\Specifications\SameFileSpecificationFixture.cs" />
     <Compile Include="MediaFiles\TrackImport\Specifications\UpgradeSpecificationFixture.cs" />
     <Compile Include="MediaFiles\ImportApprovedEpisodesFixture.cs" />
     <Compile Include="MediaFiles\MediaFileRepositoryFixture.cs" />
diff --git a/src/NzbDrone.Core/MediaFiles/TrackImport/Specifications/SameFileSpecification.cs b/src/NzbDrone.Core/MediaFiles/TrackImport/Specifications/SameFileSpecification.cs
new file mode 100644
index 000000000..1ef2f8df6
--- /dev/null
+++ b/src/NzbDrone.Core/MediaFiles/TrackImport/Specifications/SameFileSpecification.cs
@@ -0,0 +1,43 @@
+using System.Linq;
+using NLog;
+using NzbDrone.Core.DecisionEngine;
+using NzbDrone.Core.Download;
+using NzbDrone.Core.Parser.Model;
+
+namespace NzbDrone.Core.MediaFiles.TrackImport.Specifications
+{
+    public class SameFileSpecification : IImportDecisionEngineSpecification
+    {
+        private readonly Logger _logger;
+
+        public SameFileSpecification(Logger logger)
+        {
+            _logger = logger;
+        }
+
+        public Decision IsSatisfiedBy(LocalTrack localTrack)
+        {
+            var trackFiles = localTrack.Tracks.Where(e => e.TrackFileId != 0).Select(e => e.TrackFile).ToList();
+
+            if (trackFiles.Count == 0)
+            {
+                _logger.Debug("No existing track file, skipping");
+                return Decision.Accept();
+            }
+
+            if (trackFiles.Count > 1)
+            {
+                _logger.Debug("More than one existing track file, skipping.");
+                return Decision.Accept();
+            }
+
+            if (trackFiles.First().Value.Size == localTrack.Size)
+            {
+                _logger.Debug("'{0}' Has the same filesize as existing file", localTrack.Path);
+                return Decision.Reject("Has the same filesize as existing file");
+            }
+
+            return Decision.Accept();
+        }
+    }
+}
diff --git a/src/NzbDrone.Core/NzbDrone.Core.csproj b/src/NzbDrone.Core/NzbDrone.Core.csproj
index 06c7af236..f39bac565 100644
--- a/src/NzbDrone.Core/NzbDrone.Core.csproj
+++ b/src/NzbDrone.Core/NzbDrone.Core.csproj
@@ -633,6 +633,7 @@
     <Compile Include="MediaFiles\TrackImport\Manual\ManuallyImportedFile.cs" />
     <Compile Include="MediaFiles\TrackImport\Specifications\FreeSpaceSpecification.cs" />
     <Compile Include="MediaFiles\TrackImport\Specifications\NotUnpackingSpecification.cs" />
+    <Compile Include="MediaFiles\TrackImport\Specifications\SameFileSpecification.cs" />
     <Compile Include="MediaFiles\TrackImport\Specifications\UpgradeSpecification.cs" />
     <Compile Include="MediaFiles\Events\ArtistRenamedEvent.cs" />
     <Compile Include="MediaFiles\Events\ArtistScannedEvent.cs" />