diff --git a/matlab/peak_detect.m b/matlab/peak_detect.m
index 3c4046d..3e10209 100644
--- a/matlab/peak_detect.m
+++ b/matlab/peak_detect.m
@@ -37,7 +37,7 @@ d_max = 30;
 
 s = zeros(1, Nh);
 a = zeros(1, Nh);
-Xm = -0*ones(1, Nh);
+Xm = zeros(1, Nh);
 Xs = zeros(1, Nh);
 peak_count = zeros(1, Nh);
 am = 0.1;