diff --git a/src/scirpy/tests/test_ir_dist_metrics.py b/src/scirpy/tests/test_ir_dist_metrics.py
index c12d8768b..d6154bfc1 100644
--- a/src/scirpy/tests/test_ir_dist_metrics.py
+++ b/src/scirpy/tests/test_ir_dist_metrics.py
@@ -745,6 +745,7 @@ def test_tcrdist_histogram_not_implemented():
         seqs = np.array(["AAAA", "AA", "AABB", "ABA"])
         _ = tcrdist_calculator.calc_dist_mat(seqs, seqs)
 
+
 @pytest.mark.gpu
 def test_gpu_hamming_reference():
     # test hamming distance against reference implementation