diff --git a/parsedmarc/__init__.py b/parsedmarc/__init__.py
index b9d5eca..d8d64db 100644
--- a/parsedmarc/__init__.py
+++ b/parsedmarc/__init__.py
@@ -1439,14 +1439,14 @@ def get_dmarc_reports_from_mailbox(connection: MailboxConnection,
         _since = 1440  # default one day
         if re.match(r'\d+[mhd]$', since):
             s = re.split(r'(\d+)', since)
-                if s[2] == 'm': 
-                    _since = int(s[1])
-                elif s[2] == 'h': 
-                    _since = int(s[1])*60
-                elif s[2] == 'd': 
-                    _since = int(s[1])*60*24
-                elif s[2] == 'w': 
-                    _since = int(s[1])*60*24*7
+            if s[2] == 'm':
+                _since = int(s[1])
+            elif s[2] == 'h':
+                _since = int(s[1])*60
+            elif s[2] == 'd':
+                _since = int(s[1])*60*24
+            elif s[2] == 'w':
+                _since = int(s[1])*60*24*7
         else:
             logger.warning("Incorrect format for \'since\' option. \
                            Provided value:{0}, Expected values:(5m|3h|2d|1w). \