diff --git a/NzbDrone.Common/PathEqualityComparer.cs b/NzbDrone.Common/PathEqualityComparer.cs
index c70abb7b7..2bf854727 100644
--- a/NzbDrone.Common/PathEqualityComparer.cs
+++ b/NzbDrone.Common/PathEqualityComparer.cs
@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
+using NzbDrone.Common.EnvironmentInfo;
 
 namespace NzbDrone.Common
 {
@@ -14,7 +15,12 @@ namespace NzbDrone.Common
 
         public int GetHashCode(string obj)
         {
-            return obj.CleanFilePath().GetHashCode();
+            if (OsInfo.IsLinux)
+            {
+                return obj.CleanFilePath().GetHashCode();
+            }
+
+            return obj.CleanFilePath().ToLower().GetHashCode();
         }
     }
 }
diff --git a/NzbDrone.Core.Test/MediaFileTests/MediaFileServiceTest.cs b/NzbDrone.Core.Test/MediaFileTests/MediaFileServiceTest.cs
index c97082e3d..1e1060239 100644
--- a/NzbDrone.Core.Test/MediaFileTests/MediaFileServiceTest.cs
+++ b/NzbDrone.Core.Test/MediaFileTests/MediaFileServiceTest.cs
@@ -81,12 +81,11 @@ namespace NzbDrone.Core.Test.MediaFileTests
             Subject.FilterExistingFiles(files, 10).Should().NotContain("c:\\file2.avi".AsOsAgnostic());
         }
 
-
-
-
         [Test]
         public void filter_should_return_none_existing_files_ignoring_case()
         {
+            WindowsOnly();
+
             var files = new List<string>()
             {
                 "c:\\file1.avi".AsOsAgnostic(),
@@ -105,5 +104,44 @@ namespace NzbDrone.Core.Test.MediaFileTests
             Subject.FilterExistingFiles(files, 10).Should().HaveCount(2);
             Subject.FilterExistingFiles(files, 10).Should().NotContain("c:\\file2.avi".AsOsAgnostic());
         }
+
+        [Test]
+        public void filter_should_return_none_existing_files_not_ignoring_case()
+        {
+            LinuxOnly();
+
+            var files = new List<string>()
+            {
+                "c:\\file1.avi".AsOsAgnostic(),
+                "c:\\FILE2.avi".AsOsAgnostic(),
+                "c:\\file3.avi".AsOsAgnostic()
+            };
+
+            Mocker.GetMock<IMediaFileRepository>()
+                .Setup(c => c.GetFilesBySeries(It.IsAny<int>()))
+                .Returns(new List<EpisodeFile>
+                {
+                    new EpisodeFile{Path = "c:\\file2.avi".AsOsAgnostic()}
+                });
+
+            Subject.FilterExistingFiles(files, 10).Should().HaveCount(3);
+        }
+
+        [Test]
+        public void filter_should_not_change_casing()
+        {
+            var files = new List<string>()
+            {
+                "c:\\FILE1.avi".AsOsAgnostic()
+            };
+
+            Mocker.GetMock<IMediaFileRepository>()
+                .Setup(c => c.GetFilesBySeries(It.IsAny<int>()))
+                .Returns(new List<EpisodeFile>());
+
+            Subject.FilterExistingFiles(files, 10).Should().HaveCount(1);
+            Subject.FilterExistingFiles(files, 10).Should().NotContain(files.First().ToLower());
+            Subject.FilterExistingFiles(files, 10).Should().Contain(files.First());
+        }
     }
 }
\ No newline at end of file
diff --git a/NzbDrone.Core/MediaFiles/MediaFileService.cs b/NzbDrone.Core/MediaFiles/MediaFileService.cs
index a2fe8ba22..54501c859 100644
--- a/NzbDrone.Core/MediaFiles/MediaFileService.cs
+++ b/NzbDrone.Core/MediaFiles/MediaFileService.cs
@@ -76,11 +76,11 @@ namespace NzbDrone.Core.MediaFiles
 
         public List<string> FilterExistingFiles(List<string> files, int seriesId)
         {
-            var seriesFiles = GetFilesBySeries(seriesId).Select(f => f.Path.CleanFilePath().ToLower()).ToList();
+            var seriesFiles = GetFilesBySeries(seriesId).Select(f => f.Path.CleanFilePath()).ToList();
 
             if (!seriesFiles.Any()) return files;
 
-            return files.Select(f => f.CleanFilePath().ToLower()).Except(seriesFiles).ToList();
+            return files.Select(f => f.CleanFilePath()).Except(seriesFiles, new PathEqualityComparer()).ToList();
         }
 
         public EpisodeFile Get(int id)