diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 30e477433..940bec4f4 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -33,7 +33,7 @@ jobs:
           if-no-files-found: error
   test:
     needs: build-python-package
-    name: 'Test os: ${{ matrix.os }}, py: ${{ matrix.python-version }}, matrix: ${{ matrix.matrix-backend }}, nprocs: ${{ matrix.nprocs }}, numpy: ${{ matrix.numpy-version }}'
+    name: 'Test os: ${{ matrix.os }}, py: ${{ matrix.python-version }}, matrix: ${{ matrix.matrix-backend }}, nprocs: ${{ matrix.nprocs }}, numpy: ${{ matrix.numpy-version }}, tensorial: ${{ matrix.tensorial }}'
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
@@ -56,6 +56,8 @@ jobs:
           - {os: ubuntu-latest , python-version: 3.9, matrix-backend: numpy, nprocs: 2, numpy-version: latest}
           # numpy-version
           - {os: ubuntu-latest , python-version: 3.8, matrix-backend: numpy, nprocs: 1, numpy-version: 1.16  }
+          # tensorial
+          - {os: ubuntu-latest , python-version: 3.9, matrix-backend: numpy, nprocs: 1, numpy-version: latest, tensorial: test}
       fail-fast: false
     env:
       NUTILS_MATRIX: ${{ matrix.matrix-backend }}
@@ -65,6 +67,7 @@ jobs:
       MKL_DYNAMIC: FALSE
       MKL_NUM_THREADS: 1
       PYTHONHASHSEED: 0
+      NUTILS_TENSORIAL: ${{ matrix.tensorial }}
     steps:
       - name: Checkout
         uses: actions/checkout@v2
diff --git a/nutils/topology.py b/nutils/topology.py
index eae573c54..6def54f97 100644
--- a/nutils/topology.py
+++ b/nutils/topology.py
@@ -884,7 +884,7 @@ def basis_discont(self, degree: int) -> function.Basis:
 
   class _TensorialTopology(Topology):
 
-    def take_unchecked(self, __indices: numpy.ndarray, __idim: int, __ndim: int) -> Topology:
+    def take_unchecked(self, __indices: numpy.ndarray) -> Topology:
       raise SkipTest('`{}` does not implement `Topology.take_unchecked`'.format(type(self).__qualname__))
 
     def __and__(self, other: Any) -> Topology: