diff --git a/src/GitVersionExe.Tests/ArgumentParserTests.cs b/src/GitVersionExe.Tests/ArgumentParserTests.cs
index 6e8b277668..eb84d64760 100644
--- a/src/GitVersionExe.Tests/ArgumentParserTests.cs
+++ b/src/GitVersionExe.Tests/ArgumentParserTests.cs
@@ -291,4 +291,12 @@ public void log_path_can_contain_forward_slash()
         var arguments = ArgumentParser.ParseArguments("-l /some/path");
         arguments.LogFilePath.ShouldBe("/some/path");
     }
+
+    [Test]
+    public void boolean_argument_handling()
+    {
+        var arguments = ArgumentParser.ParseArguments("/nofetch /updateassemblyinfo true");
+        arguments.NoFetch.ShouldBe(true);
+        arguments.UpdateAssemblyInfo.ShouldBe(true);
+    }
 }
\ No newline at end of file
diff --git a/src/GitVersionExe/ArgumentParser.cs b/src/GitVersionExe/ArgumentParser.cs
index ff3fced2af..ffc544e221 100644
--- a/src/GitVersionExe/ArgumentParser.cs
+++ b/src/GitVersionExe/ArgumentParser.cs
@@ -393,7 +393,7 @@ static bool IsBooleanArgument(string switchName)
                 "nofetch"
             };
 
-            return booleanArguments.Contains(switchName, StringComparer.OrdinalIgnoreCase);
+            return booleanArguments.Contains(switchName.Substring(1), StringComparer.OrdinalIgnoreCase);
         }
     }
 }
\ No newline at end of file