diff --git a/dace/subsets.py b/dace/subsets.py
index 831666cc28..82cc9e8797 100644
--- a/dace/subsets.py
+++ b/dace/subsets.py
@@ -953,7 +953,7 @@ def offset_by(self, off: Collection, negative: bool):
         return Indices([self.indices[i] + mult * off for i, off in enumerate(off)])
 
     def offset_new(self, other, negative, indices=None):
-        assert indices is None
+        assert not indices
         if not isinstance(other, Subset):
             if isinstance(other, (list, tuple)):
                 other = Indices(other)