diff --git a/robot/arlo.py b/robot/arlo.py
index a357094..6df97d9 100644
--- a/robot/arlo.py
+++ b/robot/arlo.py
@@ -13,8 +13,8 @@ FOCAL_LENGTH = 1691
 
 DEFAULT_CALIBRATION_CODE = "40.40-40.40-40.40_ff-ff-ff-ff"
 
-CAMERA_MATRIX = np.array([[FOCAL_LENGTH,0,512],[0,FOCAL_LENGTH,360],[0,0,1]])
-DIST_COEF = np.array([0,0,0,0,0])
+CAMERA_MATRIX = np.array([[FOCAL_LENGTH*1.,0.,512.],[0,FOCAL_LENGTH*1.,360.],[0.,0.,1.]])
+DIST_COEF = np.array([0.,0.,0.,0.,0.])
 
 def test_forward(arlo, l_power, r_power):
     arlo.reset_encoder_counts()