diff --git a/src/NzbDrone.Core.Test/ParserTests/ReleaseGroupParserFixture.cs b/src/NzbDrone.Core.Test/ParserTests/ReleaseGroupParserFixture.cs
index a9689d09c..d61e7cae5 100644
--- a/src/NzbDrone.Core.Test/ParserTests/ReleaseGroupParserFixture.cs
+++ b/src/NzbDrone.Core.Test/ParserTests/ReleaseGroupParserFixture.cs
@@ -76,6 +76,7 @@ public void should_not_include_language_in_release_group(string title, string ex
         [TestCase("Rambo.Last.Blood.2019.1080p.BDRip.X264.AC3-EVO-Chamele0n", "EVO")]
         [TestCase("Rambo.Last.Blood.2019.1080p.BDRip.X264.AC3-EVO-4P", "EVO")]
         [TestCase("Rambo.Last.Blood.2019.1080p.BDRip.X264.AC3-EVO-4Planet", "EVO")]
+        [TestCase("Rambo.Last.Blood.2019.1080p.BDRip.X264.AC3-DON-AlteZachen", "DON")]
         public void should_not_include_repost_in_release_group(string title, string expected)
         {
             Parser.Parser.ParseReleaseGroup(title).Should().Be(expected);
diff --git a/src/NzbDrone.Core/Parser/Parser.cs b/src/NzbDrone.Core/Parser/Parser.cs
index 7d28f06c7..0e01098ba 100644
--- a/src/NzbDrone.Core/Parser/Parser.cs
+++ b/src/NzbDrone.Core/Parser/Parser.cs
@@ -106,7 +106,7 @@ public static class Parser
                                                         string.Empty,
                                                         RegexOptions.IgnoreCase | RegexOptions.Compiled);
 
-        private static readonly RegexReplace CleanReleaseGroupRegex = new RegexReplace(@"(-(RP|1|NZBGeek|Obfuscated|Obfuscation|Scrambled|sample|Pre|postbot|xpost|Rakuv[a-z0-9]*|WhiteRev|BUYMORE|AsRequested|AlternativeToRequested|GEROV|Z0iDS3N|Chamele0n|4P|4Planet))+$",
+        private static readonly RegexReplace CleanReleaseGroupRegex = new RegexReplace(@"(-(RP|1|NZBGeek|Obfuscated|Obfuscation|Scrambled|sample|Pre|postbot|xpost|Rakuv[a-z0-9]*|WhiteRev|BUYMORE|AsRequested|AlternativeToRequested|GEROV|Z0iDS3N|Chamele0n|4P|4Planet|AlteZachen))+$",
                                                                 string.Empty,
                                                                 RegexOptions.IgnoreCase | RegexOptions.Compiled);