diff --git a/pyproject.toml b/pyproject.toml
index 5c9c6e9..3b03d8d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -52,7 +52,6 @@ select = [
 ]
 ignore = [
   "C901",  # function is too complex (TODO #165: enable this)
-  "E741",  # ambiguous variable name
   "F403",  # unable to detect undefined names
   "F405",  # name may be undefined, or defined from star imports
 ]
diff --git a/test/sensors.py b/test/sensors.py
index 2d8330c..0f957eb 100644
--- a/test/sensors.py
+++ b/test/sensors.py
@@ -32,7 +32,7 @@ def interweaved(x, y):
 
 
 def mesh_for_sensors(dim, n):
-    mesh = uniform_mesh(dim, n, l=2)
+    mesh = uniform_mesh(dim, n, length=2)
     coords = firedrake.Function(mesh.coordinates)
     coords.interpolate(coords - as_vector([1] * dim))
     return firedrake.Mesh(coords)
diff --git a/test/utility.py b/test/utility.py
index 5afc7ea..87961e6 100644
--- a/test/utility.py
+++ b/test/utility.py
@@ -8,8 +8,8 @@
 from goalie.metric import RiemannianMetric
 
 
-def uniform_mesh(dim, n, l=1, **kwargs):
-    args = [n] * dim + [l]
+def uniform_mesh(dim, n, length=1, **kwargs):
+    args = [n] * dim + [length]
     return (firedrake.SquareMesh if dim == 2 else firedrake.CubeMesh)(*args, **kwargs)