diff --git a/src/NzbDrone.Core.Test/ParserTests/QualityParserFixture.cs b/src/NzbDrone.Core.Test/ParserTests/QualityParserFixture.cs
index 8378f221c..cd57836e0 100644
--- a/src/NzbDrone.Core.Test/ParserTests/QualityParserFixture.cs
+++ b/src/NzbDrone.Core.Test/ParserTests/QualityParserFixture.cs
@@ -204,6 +204,7 @@ public void should_parse_raw_quality(string title, bool proper)
 
         [TestCase("Sonny.With.a.Chance.S02E15", false)]
         [TestCase("Law & Order: Special Victims Unit - 11x11 - Quickie", false)]
+        [TestCase("Series.Title.S01E01.webm", false)]
         public void quality_parse(string title, bool proper)
         {
             ParseAndVerifyQuality(title, Quality.Unknown, proper);
diff --git a/src/NzbDrone.Core/MediaFiles/MediaFileExtensions.cs b/src/NzbDrone.Core/MediaFiles/MediaFileExtensions.cs
index f2372dfb6..2d78b4b56 100644
--- a/src/NzbDrone.Core/MediaFiles/MediaFileExtensions.cs
+++ b/src/NzbDrone.Core/MediaFiles/MediaFileExtensions.cs
@@ -13,6 +13,10 @@ static MediaFileExtensions()
         {
             _fileExtensions = new Dictionary<string, Quality>
             {
+                //Unknown
+                { ".webm", Quality.Unknown },
+
+                //SDTV
                 { ".m4v", Quality.SDTV },
                 { ".3gp", Quality.SDTV },
                 { ".nsv", Quality.SDTV },