diff --git a/loki/dimension.py b/loki/dimension.py
index a7611b403..48103b496 100644
--- a/loki/dimension.py
+++ b/loki/dimension.py
@@ -131,6 +131,6 @@ def index_expressions(self):
 
         exprs = [self.index,]
         if self._index_aliases:
-            exprs += [alias for alias in self._index_aliases]
+            exprs += list(self._index_aliases)
 
         return as_tuple(exprs)
diff --git a/transformations/tests/test_block_index_inject.py b/transformations/tests/test_block_index_inject.py
index 547ae9e18..af022ab59 100644
--- a/transformations/tests/test_block_index_inject.py
+++ b/transformations/tests/test_block_index_inject.py
@@ -324,4 +324,4 @@ def test_blockview_to_fieldview_exception(frontend, horizontal):
     item.trafo_data['foobar'] = {'definitions': []}
     with pytest.raises(RuntimeError):
         BlockViewToFieldViewTransformation(horizontal, key='foobar').apply(kernel, item=item, role='kernel',
-                                                             targets=('compute',))
\ No newline at end of file
+                                                             targets=('compute',))