diff --git a/lib/solaar/cli.py b/lib/solaar/cli.py
index f640db7f..1f9feaeb 100644
--- a/lib/solaar/cli.py
+++ b/lib/solaar/cli.py
@@ -399,8 +399,8 @@ def _parse_arguments():
 
 	if args.debug > 0:
 		log_level = logging.WARNING - 10 * args.debug
-		log_format='%(asctime)s %(levelname)8s %(name)s: %(message)s'
-		logging.basicConfig(level=max(log_level, logging.DEBUG), format=log_format)
+		log_format='%(asctime)s,%(msecs)03d %(levelname)8s %(name)s: %(message)s'
+		logging.basicConfig(level=max(log_level, logging.DEBUG), format=log_format, datefmt='%H:%M:%S')
 	else:
 		logging.root.addHandler(logging.NullHandler())
 		logging.root.setLevel(logging.ERROR)
diff --git a/lib/solaar/gtk.py b/lib/solaar/gtk.py
index ead8efb8..ee06f421 100644
--- a/lib/solaar/gtk.py
+++ b/lib/solaar/gtk.py
@@ -30,8 +30,8 @@ def _parse_arguments():
 	import logging
 	if args.debug > 0:
 		log_level = logging.WARNING - 10 * args.debug
-		log_format='%(asctime)s %(levelname)8s [%(threadName)s] %(name)s: %(message)s'
-		logging.basicConfig(level=max(log_level, logging.DEBUG), format=log_format)
+		log_format='%(asctime)s,%(msecs)03d %(levelname)8s [%(threadName)s] %(name)s: %(message)s'
+		logging.basicConfig(level=max(log_level, logging.DEBUG), format=log_format, datefmt='%H:%M:%S')
 	else:
 		logging.root.addHandler(logging.NullHandler())
 		logging.root.setLevel(logging.ERROR)