diff --git a/pytato/target/loopy/codegen.py b/pytato/target/loopy/codegen.py
index 0ffb017edd825258b23aea450cb5d2853bde1cd3..dc463de4b87889f6a6967ba57a5cef886dd5f09d 100644
--- a/pytato/target/loopy/codegen.py
+++ b/pytato/target/loopy/codegen.py
@@ -643,6 +643,8 @@ def shape_to_scalar_expression(shape: ShapeType,
             result.append(
                 cgen_mapper(component, state).to_loopy_expression((), shape_context))
 
+    assert not shape_context.depends_on
+
     return tuple(result)