diff --git a/gwinc/noise/newtonian.py b/gwinc/noise/newtonian.py
index 09c21d62e04a0501e30c51c38caab50663f1f10e..edbfbee932e19db553a14418e1f76815e784f2a6 100644
--- a/gwinc/noise/newtonian.py
+++ b/gwinc/noise/newtonian.py
@@ -85,9 +85,6 @@ def gravg_rayleigh(f, ifo):
     gamma = ifo.Seismic.Gamma
     ggcst = const.G
     rho = ifo.Seismic.Rho
-    # factor to account for correlation between masses
-    # and the height of the mirror above the ground
-    beta = ifo.Seismic.Beta
     h = ifo.Seismic.TestMassHeight
     c_rayleigh = ifo.Seismic.RayleighWaveSpeed