diff --git a/src/lightning/pytorch/loggers/comet.py b/src/lightning/pytorch/loggers/comet.py
index 1c44d08f06137..0f0ff4047e3b7 100644
--- a/src/lightning/pytorch/loggers/comet.py
+++ b/src/lightning/pytorch/loggers/comet.py
@@ -266,7 +266,7 @@ def __init__(
 
         self._create_experiment()
 
-    def _create_experiment(self):
+    def _create_experiment(self) -> None:
         import comet_ml
 
         self._experiment = comet_ml.start(