diff --git a/dmarcts-report-parser.pl b/dmarcts-report-parser.pl
index e40a912..c58618e 100755
--- a/dmarcts-report-parser.pl
+++ b/dmarcts-report-parser.pl
@@ -155,7 +155,7 @@ sub show_usage {
   
 # Get command line options.
 my %options = ();
-use constant { TS_IMAP => 0, TS_MESSAGE_FILE => 1, TS_XML_FILE => 2, TS_MBOX_FILE => 3 };
+use constant { TS_IMAP => 0, TS_MESSAGE_FILE => 1, TS_XML_FILE => 2, TS_MBOX_FILE => 3, TS_ZIP_FILE => 4 };
 GetOptions( \%options, 'd', 'r', 'x', 'm', 'e', 'i', 'z', 'delete', 'info' );
 
 # Evaluate command line options