diff --git a/octoprint/server.py b/octoprint/server.py
index 8d2287d7..f4b3113c 100644
--- a/octoprint/server.py
+++ b/octoprint/server.py
@@ -1039,6 +1039,11 @@ class Server():
 
 		logging.config.dictConfig(config)
 
+		if settings().getBoolean(["serial", "log"]):
+			# enable debug logging to serial.log
+			logging.getLogger("SERIAL").setLevel(logging.DEBUG)
+			logging.getLogger("SERIAL").debug("Enabling serial logging")
+
 if __name__ == "__main__":
 	octoprint = Server()
 	octoprint.run()