diff --git a/src/Main/CommandLineInterface.cpp b/src/Main/CommandLineInterface.cpp
index b1bb4bd0..7eaef070 100755
--- a/src/Main/CommandLineInterface.cpp
+++ b/src/Main/CommandLineInterface.cpp
@@ -80,7 +80,7 @@ namespace VeraCrypt
 		parser.AddSwitch (L"",	L"quick",				_("Enable quick format"));
 		parser.AddOption (L"",	L"size",				_("Size in bytes"));
 		parser.AddOption (L"",	L"slot",				_("Volume slot number"));
-		parser.AddOption (L"tc",L"truecrypt",			_("Enable TrueCrypt mode. Should be put first to avoid issues."));
+		parser.AddSwitch (L"tc",L"truecrypt",			_("Enable TrueCrypt mode. Should be put first to avoid issues."));
 		parser.AddSwitch (L"",	L"test",				_("Test internal algorithms"));
 		parser.AddSwitch (L"t", L"text",				_("Use text user interface"));
 		parser.AddOption (L"",	L"token-lib",			_("Security token library"));