diff --git a/python_apps/media-monitor/airtimefilemonitor/airtimemediamonitorbootstrap.py b/python_apps/media-monitor/airtimefilemonitor/airtimemediamonitorbootstrap.py
index 35d69e6f7..ef8fc0731 100644
--- a/python_apps/media-monitor/airtimefilemonitor/airtimemediamonitorbootstrap.py
+++ b/python_apps/media-monitor/airtimefilemonitor/airtimemediamonitorbootstrap.py
@@ -74,7 +74,7 @@ class AirtimeMediaMonitorBootstrap():
         all_files_set = set()
         for file_path in new_files:
             if len(file_path.strip(" \n")) > 0:
-                all_files_set.add(file_path[len(dir)+1:])           
+                all_files_set.add(file_path[len(dir):])           
         
         if os.path.exists(self.pe.timestamp_file):
             """find files that have been modified since the last time media-monitor process started."""
@@ -124,4 +124,4 @@ class AirtimeMediaMonitorBootstrap():
             file_path = "%s/%s" % (dir, file_path)
             if os.path.exists(file_path):
                 self.pe.handle_modified_file(False, os.path.basename(file_path), file_path)
-                                       
\ No newline at end of file
+