diff --git a/octoprint_estop/__init__.py b/octoprint_estop/__init__.py
index b2c0664..6c65c58 100644
--- a/octoprint_estop/__init__.py
+++ b/octoprint_estop/__init__.py
@@ -45,6 +45,7 @@ class EstopPlugin(octoprint.plugin.StartupPlugin,
 		)
 
 __plugin_name__ = "Emergency Stop Button"
+__plugin_pythoncompat__ = ">=2.7,<4"
 
 def __plugin_load__():
 	global __plugin_implementation__
@@ -53,4 +54,4 @@ def __plugin_load__():
 	global __plugin_hooks__
 	__plugin_hooks__ = {
 		"octoprint.plugin.softwareupdate.check_config": __plugin_implementation__.get_update_information
-	}
\ No newline at end of file
+	}