diff --git a/C5-test-bench-id31/test_id31_4_hac.m b/C5-test-bench-id31/test_id31_4_hac.m
index f9929d0..4609bc3 100644
--- a/C5-test-bench-id31/test_id31_4_hac.m
+++ b/C5-test-bench-id31/test_id31_4_hac.m
@@ -204,10 +204,6 @@ wc = 2*pi*5; % [rad/s]
 % Integrator
 H_int = wc/s;
 
-% Lead to increase phase margin
-a  = 2;  % Amount of phase lead / width of the phase lead / high frequency gain
-H_lead = 1/sqrt(a)*(1 + s/(wc/sqrt(a)))/(1 + s/(wc*sqrt(a)));
-
 % Low Pass filter to increase robustness
 H_lpf = 1/(1 + s/2/pi/30);