diff --git a/src/total_checksum.py b/src/total_checksum.py
index dbf1303..d294a82 100755
--- a/src/total_checksum.py
+++ b/src/total_checksum.py
@@ -100,7 +100,7 @@ def main():
 def parseArguments():
 	parser = argparse.ArgumentParser(description='Verify votes are correct using a simple checksum')
 	parser.add_argument('--verbose', '-v', dest='verbose', action='store_true')
-	parser.add_argument('--includeOverUnder', dest='includeOverUnder', action='store_true')
+	parser.add_argument('--excludeOverUnder', dest='includeOverUnder', action='store_false')
 	parser.add_argument('path', type=str, help='path to a CSV file')
 	parser.set_defaults(verbose=False)