diff --git a/octoprint_estop/__init__.py b/octoprint_estop/__init__.py
index b2c0664..93a5bc1 100644
--- a/octoprint_estop/__init__.py
+++ b/octoprint_estop/__init__.py
@@ -3,29 +3,33 @@ from __future__ import absolute_import
 
 import octoprint.plugin
 
+
 class EstopPlugin(octoprint.plugin.StartupPlugin,
-				octoprint.plugin.AssetPlugin,
-				octoprint.plugin.TemplatePlugin,
-				octoprint.plugin.SettingsPlugin):
+				  octoprint.plugin.AssetPlugin,
+				  octoprint.plugin.TemplatePlugin,
+				  octoprint.plugin.SettingsPlugin):
 
 	def get_settings_defaults(self):
-		return dict(estopCommand = "M112")
+		return dict(estopCommand="M112")
 
 	def on_after_startup(self):
 		self.estopCommand = self._settings.get(["estopCommand"])
 		if (self.estopCommand != "M112"):
-			self._logger.warn("WARNING! EMERGENCY STOP COMMAND HAS BEEN CHANGED FROM DEFAULT \"M112\" TO \"" + self.estopCommand + "\"")
+			self._logger.warn(
+				"WARNING! EMERGENCY STOP COMMAND HAS BEEN CHANGED FROM DEFAULT \"M112\" TO \"" + self.estopCommand + "\"")
 
 	def get_assets(self):
 		return dict(
 			js=["js/estop.js"],
 			css=["css/estop.css"]
 		)
+
 	def get_template_configs(self):
 		return [
-			dict(type="sidebar", name="Emergency STOP!", icon="close", template="estop_sidebar.jinja2", styles=["display: none"], data_bind="visible: loginState.isUser"),
+			dict(type="sidebar", name="Emergency STOP!", icon="close", template="estop_sidebar.jinja2",
+				 styles=["display: none"], data_bind="visible: loginState.isUser"),
 			dict(type="settings", name="E-Stop Settings", template="estop_settings.jinja2", custom_bindings=False)
-			]
+		]
 
 	def get_update_information(self):
 		return dict(
@@ -44,7 +48,10 @@ class EstopPlugin(octoprint.plugin.StartupPlugin,
 			)
 		)
 
+
 __plugin_name__ = "Emergency Stop Button"
+__plugin_pythoncompat__ = ">=2.7,<4"  # python 2 and 3
+
 
 def __plugin_load__():
 	global __plugin_implementation__
@@ -53,4 +60,4 @@ def __plugin_load__():
 	global __plugin_hooks__
 	__plugin_hooks__ = {
 		"octoprint.plugin.softwareupdate.check_config": __plugin_implementation__.get_update_information
-	}
\ No newline at end of file
+	}