diff --git a/source/Commands/CommandObjectFile.cpp b/source/Commands/CommandObjectFile.cpp
index 4a560ab..db2bd76 100644
--- a/source/Commands/CommandObjectFile.cpp
+++ b/source/Commands/CommandObjectFile.cpp
@@ -38,8 +38,8 @@
 lldb::OptionDefinition
 CommandObjectFile::CommandOptions::g_option_table[] =
 {
-    { LLDB_OPT_SET_1, false, "arch", 'a', required_argument, NULL, 0, "<arch>", "Specify the architecture to be used when the process is launched."},
-    { 0, false, NULL, 0, 0, NULL, 0, NULL, NULL }
+    { LLDB_OPT_SET_1, false, "arch", 'a', required_argument, NULL, 0, eArgTypeArchitecture, "Specify the architecture to be used when the process is launched."},
+    { 0, false, NULL, 0, 0, NULL, 0, eArgTypeNone, NULL }
 };
 
 const lldb::OptionDefinition *