diff --git a/matlab/mode_check.m b/matlab/mode_check.m
index 0498807d76712a47652ccef56331d83b0491b872..291cc2bc6c334db3fc590d855ddabaf0f7a0b8ac 100644
--- a/matlab/mode_check.m
+++ b/matlab/mode_check.m
@@ -112,7 +112,7 @@ for plt = 1:nbplt,
             l1 = x(kk) - (l2-x(kk));
             m1 = 1;
         end
-        if ~m1 && (l1>(1-ll)*x(kk)) && (x(kk)+(x(kk)-l1)<ub(kk))
+        if ~m1 && (l1>(1-ll)*x(kk)) && (x(kk)+(x(kk)-l1)<BayesInfo.ub(kk))
             l2 = x(kk) + (x(kk)-l1);
         end
         z1 = l1:((x(kk)-l1)/10):x(kk);