diff --git a/src/NzbDrone.Core.Test/ParserTests/QualityParserFixture.cs b/src/NzbDrone.Core.Test/ParserTests/QualityParserFixture.cs
index d2a0b1858..f2e6039c6 100644
--- a/src/NzbDrone.Core.Test/ParserTests/QualityParserFixture.cs
+++ b/src/NzbDrone.Core.Test/ParserTests/QualityParserFixture.cs
@@ -126,6 +126,9 @@ public void should_parse_flac_quality(string title, string desc, int bitrate)
         [TestCase("Green_Day-Father_Of_All-24-44-WEB-FLAC-2020-OBZEN", null, 0, 0)]
         [TestCase("", "Flac Audio", 5057, 24)]
         [TestCase("[TR24][OF] Good Charlotte - Generation Rx - 2018 (Pop-Punk | Alternative Rock)", null, 0, 0)]
+        [TestCase("Green Day - Father Of All [FLAC (M4A) 24-bit Lossless]", null, 0, 0)]
+        [TestCase("Green_Day-Father_Of_All_FLAC_M4A_24_bit_Lossless", null, 0, 0)]
+        [TestCase("Green.Day-Father.Of.All.FLAC.M4A.24.bit.Lossless", null, 0, 0)]
         public void should_parse_flac_24bit_quality(string title, string desc, int bitrate, int sampleSize)
         {
             ParseAndVerifyQuality(title, desc, bitrate, Quality.FLAC_24, sampleSize);
diff --git a/src/NzbDrone.Core/Parser/QualityParser.cs b/src/NzbDrone.Core/Parser/QualityParser.cs
index 9b3c2d6c9..32b7e7542 100644
--- a/src/NzbDrone.Core/Parser/QualityParser.cs
+++ b/src/NzbDrone.Core/Parser/QualityParser.cs
@@ -36,7 +36,7 @@ public class QualityParser
                                                                 (?<VBRV2>V2[ ]?kbps|V2|[\[\(].*V2.*[\]\)]))\b",
                                                                 RegexOptions.Compiled | RegexOptions.IgnoreCase | RegexOptions.IgnorePatternWhitespace);
 
-        private static readonly Regex SampleSizeRegex = new (@"\b(?:(?<S24>24[ ]?bit|tr24|24-(?:44|48|96|192)|[\[\(].*24bit.*[\]\)]))\b", RegexOptions.Compiled);
+        private static readonly Regex SampleSizeRegex = new (@"\b(?:(?<S24>24[-._ ]?bit|tr24|24-(?:44|48|96|192)|[\[\(].*24bit.*[\]\)]))\b", RegexOptions.Compiled);
 
         private static readonly Regex CodecRegex = new (@"\b(?:(?<MP1>MPEG Version \d(.5)? Audio, Layer 1|MP1)|(?<MP2>MPEG Version \d(.5)? Audio, Layer 2|MP2)|(?<MP3VBR>MP3.*VBR|MPEG Version \d(.5)? Audio, Layer 3 vbr)|(?<MP3CBR>MP3|MPEG Version \d(.5)? Audio, Layer 3)|(?<FLAC>(web)?flac|TR24)|(?<WAVPACK>wavpack|wv)|(?<ALAC>alac)|(?<WMA>WMA\d?)|(?<WAV>WAV|PCM)|(?<AAC>M4A|M4P|M4B|AAC|mp4a|MPEG-4 Audio(?!.*alac))|(?<OGG>OGG|OGA|Vorbis))\b|(?<APE>monkey's audio|[\[|\(].*\bape\b.*[\]|\)])|(?<OPUS>Opus Version \d(.5)? Audio|[\[|\(].*\bopus\b.*[\]|\)])",
                                                                   RegexOptions.Compiled | RegexOptions.IgnoreCase);