diff --git a/cython/gtsam/examples/Pose2SLAMExample.py b/cython/gtsam/examples/Pose2SLAMExample.py
index f039b43e9..58006f2c8 100644
--- a/cython/gtsam/examples/Pose2SLAMExample.py
+++ b/cython/gtsam/examples/Pose2SLAMExample.py
@@ -20,14 +20,14 @@ import numpy as np
 import gtsam
 
 
-def Vector3(x, y, z):
+def vector3(x, y, z):
     """Create 3d double numpy array."""
     return np.array([x, y, z], dtype=np.float)
 
 
 # Create noise models
-PRIOR_NOISE = gtsam.noiseModel_Diagonal.Sigmas(Vector3(0.3, 0.3, 0.1))
-ODOMETRY_NOISE = gtsam.noiseModel_Diagonal.Sigmas(Vector3(0.2, 0.2, 0.1))
+PRIOR_NOISE = gtsam.noiseModel_Diagonal.Sigmas(vector3(0.3, 0.3, 0.1))
+ODOMETRY_NOISE = gtsam.noiseModel_Diagonal.Sigmas(vector3(0.2, 0.2, 0.1))
 
 # 1. Create a factor graph container and add factors to it
 graph = gtsam.NonlinearFactorGraph()