diff --git a/src/pystencils/backend/platforms/cuda.py b/src/pystencils/backend/platforms/cuda.py
index a389628368eb4f56dfb9de805c8a5cdb109cba27..338a7d490af9e09edb604e0390d3e7b7870b469f 100644
--- a/src/pystencils/backend/platforms/cuda.py
+++ b/src/pystencils/backend/platforms/cuda.py
@@ -37,7 +37,7 @@ GRID_DIM = [
 class CudaPlatform(GenericGpu):
 
     def __init__(
-        self, ctx: KernelCreationContext, indexing_cfg: GpuIndexingConfig | None
+        self, ctx: KernelCreationContext, indexing_cfg: GpuIndexingConfig | None = None
     ) -> None:
         super().__init__(ctx)
         self._cfg = indexing_cfg if indexing_cfg is not None else GpuIndexingConfig()
diff --git a/tests/nbackend/kernelcreation/platform/test_basic_gpu.py b/tests/nbackend/kernelcreation/platform/test_basic_gpu.py
index 1dc2cdb19e1ef5e4375e9bbc5446cb387949506d..90b88dcd7b73508321331f8f5c8467d06df1625b 100644
--- a/tests/nbackend/kernelcreation/platform/test_basic_gpu.py
+++ b/tests/nbackend/kernelcreation/platform/test_basic_gpu.py
@@ -25,4 +25,4 @@ def test_loop_nest(layout):
     archetype_field = Field.create_generic("fzyx_field", spatial_dimensions=3, layout=layout)
     ispace = FullIterationSpace.create_with_ghost_layers(ctx, 0, archetype_field)
 
-    condition = platform.materialize_iteration_space(body, ispace)
+    _ = platform.materialize_iteration_space(body, ispace)