diff --git a/aitviewer/utils/bvh.py b/aitviewer/utils/bvh.py
index 370be71..17e00f0 100644
--- a/aitviewer/utils/bvh.py
+++ b/aitviewer/utils/bvh.py
@@ -27,6 +27,7 @@
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 """
+
 import re
 
 import numpy as np
diff --git a/tests/utils.py b/tests/utils.py
index cfa731d..1b65ede 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -68,7 +68,7 @@ def viewer(refs):
         relative_error = np.asarray(diff).sum() / np.full(np.asarray(img).shape, 255).sum()
 
         # If the relative error is higher than this threshold report a failure.
-        if relative_error > 3e-3:
+        if relative_error > 4e-3:
             os.makedirs(FAILURE_DIR, exist_ok=True)
 
             # Store the wrong result and diff for debugging.