diff --git a/modules/contrib/docker_ps.py b/modules/contrib/docker_ps.py
index cb2a107..3f7e739 100644
--- a/modules/contrib/docker_ps.py
+++ b/modules/contrib/docker_ps.py
@@ -26,7 +26,7 @@ class Module(core.module.Module):
         state = []
         if self.__info == "OK - 0":
             state.append("warning")
-        elif self.__info in ["n/a", "Off"]:
+        elif self.__info in ["n/a", "off"]:
             state.append("critical")
         return state
 
@@ -38,7 +38,7 @@ class Module(core.module.Module):
                 len(cli.containers.list(filters={"status": "running"}))
             )
         except ConnectionError:
-            self.__info = "Off"
+            self.__info = "off"
         except Exception:
             self.__info = "n/a"
         return self.__info