diff --git a/invesalius/data/slice_.py b/invesalius/data/slice_.py
index c9b2988..f80d3d7 100644
--- a/invesalius/data/slice_.py
+++ b/invesalius/data/slice_.py
@@ -1626,7 +1626,7 @@ class Slice(metaclass=utils.Singleton):
 
         future_mask = Mask()
         future_mask.create_mask(self.matrix.shape)
-        future_mask.spacing = spacing
+        future_mask.spacing = self.spacing
         future_mask.name = new_name
 
         future_mask.matrix[:] = 1
--
libgit2 0.21.2