diff --git a/klippy/extras/exclude_object.py b/klippy/extras/exclude_object.py
index c80dd000d..3ca6d53eb 100644
--- a/klippy/extras/exclude_object.py
+++ b/klippy/extras/exclude_object.py
@@ -89,7 +89,7 @@ class ExcludeObject:
             offset = [0.] * num_coord
             self.extrusion_offsets[ename] = offset
         if len(offset) < num_coord:
-            offset.extend([0.] * (len(num_coord) - len(offset)))
+            offset.extend([0.] * (num_coord - len(offset)))
         return offset
 
     def get_position(self):