diff --git a/homeassistant/components/overkiz/cover.py b/homeassistant/components/overkiz/cover.py
index 5b871b985b74..3fb405d04bac 100644
--- a/homeassistant/components/overkiz/cover.py
+++ b/homeassistant/components/overkiz/cover.py
@@ -854,6 +854,9 @@ class OverkizCover(OverkizDescriptiveEntity, CoverEntity):
         if current_value is None or target_value is None:
             return None
 
+        if current_value in (_POSITION_MY, _POSITION_UNKNOWN):
+            return None
+
         return current_value - target_value