diff --git a/octoprint_prettygcode/__init__.py b/octoprint_prettygcode/__init__.py
index fa43ce0..fb6e179 100644
--- a/octoprint_prettygcode/__init__.py
+++ b/octoprint_prettygcode/__init__.py
@@ -38,6 +38,7 @@ def get_update_information(self):
 # ("OctoPrint-PluginSkeleton"), you may define that here. Same goes for the other metadata derived from setup.py that
 # can be overwritten via __plugin_xyz__ control properties. See the documentation for that.
 __plugin_name__ = "PrettyGCode"
+__plugin_pythoncompat__ = ">=2.7,<4"
 def __plugin_load__():
     global __plugin_implementation__ 
     __plugin_implementation__ = PrettyGCodePlugin()