diff --git a/SimPEG/Regularization.py b/SimPEG/Regularization.py
index a91da269..e43670d2 100644
--- a/SimPEG/Regularization.py
+++ b/SimPEG/Regularization.py
@@ -565,7 +565,7 @@ class Simple(Tikhonov):
     Simple regularization that does not include length scales in the derivatives.
     """
 
-    mrefInSmooth = True  #: SMOOTH and SMOOTH_MOD_DIF options
+    mrefInSmooth = False  #: SMOOTH and SMOOTH_MOD_DIF options
     alpha_s     = Utils.dependentProperty('_alpha_s', 1.0, ['_W', '_Wsmall'], "Smallness weight")
     alpha_x     = Utils.dependentProperty('_alpha_x', 1.0, ['_W', '_Wx'], "Weight for the first derivative in the x direction")
     alpha_y     = Utils.dependentProperty('_alpha_y', 1.0, ['_W', '_Wy'], "Weight for the first derivative in the y direction")