diff --git a/iwla.py b/iwla.py
index 5e00640..ac7fca6 100755
--- a/iwla.py
+++ b/iwla.py
@@ -801,7 +801,8 @@ if __name__ == '__main__':
                         default='INFO', type=str,
                         help='Loglevel in %s, default : %s' % (['DEBUG', 'INFO', 'WARNING', 'ERROR', 'CRITICAL'], 'INFO'))
 
-    parser.add_argument('-r', '--reset', dest='reset',
+    parser.add_argument('-r', '--reset', dest='reset', action='store_true',
+                        default=False,
                         help='Reset analysis to a specific date (month/year)')
 
     args = parser.parse_args()