diff --git a/octoprint_fanspeedslider/__init__.py b/octoprint_fanspeedslider/__init__.py
index e921d53..17c6f9b 100644
--- a/octoprint_fanspeedslider/__init__.py
+++ b/octoprint_fanspeedslider/__init__.py
@@ -131,6 +131,7 @@ class FanSliderPlugin(octoprint.plugin.StartupPlugin,
 		)
 
 __plugin_name__ = "Fan Speed Control"
+__plugin_pythoncompat__ = ">=2.7,<4"
 
 def __plugin_load__():
 	global __plugin_implementation__