diff --git a/pagebot.py b/pagebot.py
index a82dee8..981bd50 100644
--- a/pagebot.py
+++ b/pagebot.py
@@ -40,9 +40,11 @@ class MyHandler(FileSystemEventHandler):
         global last_file_time
         if event.is_directory:
             return
-        last_file_time = time.time()
         filepath = event.src_path
         filename, file_extension = os.path.splitext(filepath)
+        if filename.endswith('_stt'):
+            return
+        last_file_time = time.time()
         if file_extension.lower() == '.amr':
             with _processing_lock:
                 if filepath in _processing_files: