diff --git a/octoprint_fanspeedslider/__init__.py b/octoprint_fanspeedslider/__init__.py
index 89c8328..7524879 100644
--- a/octoprint_fanspeedslider/__init__.py
+++ b/octoprint_fanspeedslider/__init__.py
@@ -9,6 +9,10 @@ class FanSliderPlugin(octoprint.plugin.StartupPlugin,
 					octoprint.plugin.TemplatePlugin,
 					octoprint.plugin.SettingsPlugin,
 					octoprint.plugin.AssetPlugin):
+					
+	def __init__(self):
+		self.minPWM=0,
+		self.maxPWM=255
 
 	def on_after_startup(self):
 		self.get_settings_updates()