diff --git a/NzbDrone.Core.Test/ParserTests/ParserFixture.cs b/NzbDrone.Core.Test/ParserTests/ParserFixture.cs
index ccf1c70d4..1cf159b22 100644
--- a/NzbDrone.Core.Test/ParserTests/ParserFixture.cs
+++ b/NzbDrone.Core.Test/ParserTests/ParserFixture.cs
@@ -75,6 +75,7 @@ namespace NzbDrone.Core.Test.ParserTests
         [TestCase("Cheers S08E20 50-50 Carla [DVD]", "Cheers", 8, 20)]
         [TestCase("S02E10 6-50 to SLC [SDTV]", "", 2, 10)]
         [TestCase("Franklin & Bash S02E10 6-50 to SLC [SDTV]", "Franklin & Bash", 2, 10)]
+        [TestCase("The_Big_Bang_Theory_-_6x12_-_The_Egg_Salad_Equivalency_[HDTV-720p]", "The Big Bang Theory", 6, 12)]
         public void ParseTitle_single(string postTitle, string title, int seasonNumber, int episodeNumber)
         {
             var result = Parser.ParseTitle(postTitle);
diff --git a/NzbDrone.Core/Parser.cs b/NzbDrone.Core/Parser.cs
index cfadf83e2..97096ee1d 100644
--- a/NzbDrone.Core/Parser.cs
+++ b/NzbDrone.Core/Parser.cs
@@ -65,7 +65,7 @@ namespace NzbDrone.Core
                                         RegexOptions.IgnoreCase | RegexOptions.Compiled)
                                 };
 
-        private static readonly Regex NormalizeRegex = new Regex(@"((^|\W)(a|an|the|and|or|of)($|\W))|\W|_|(?:(?<=[^0-9]+)|\b)(?!(?:19\d{2}|20\d{2}))\d+(?=[^0-9ip]+|\b)",
+        private static readonly Regex NormalizeRegex = new Regex(@"((^|\W)(a|an|the|and|or|of)($|\W|_))|\W|_|(?:(?<=[^0-9]+)|\b)(?!(?:19\d{2}|20\d{2}))\d+(?=[^0-9ip]+|\b)",
                                                                  RegexOptions.IgnoreCase | RegexOptions.Compiled);
 
         private static readonly Regex SimpleTitleRegex = new Regex(@"480[i|p]|720[i|p]|1080[i|p]|[x|h|x\s|h\s]264|DD\W?5\W1|\<|\>|\?|\*|\:|\||""",