diff --git a/prestartup_script.py b/prestartup_script.py
index 2acec608..612b65f7 100644
--- a/prestartup_script.py
+++ b/prestartup_script.py
@@ -257,7 +257,7 @@ try:
 
         def sync_write(self, message, file_only=False):
             with log_lock:
-                timestamp = datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')[:-3]
+                timestamp = datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S.%f')[:-3]
                 if self.last_char != '\n':
                     log_file.write(message)
                 else: