diff --git a/test/createReport.m b/test/createReport.m
index edc2b1deec20771e8da4fb49a5df0924bf702d2b..6efcb6d5c5e8fc81f233c484dcab5f1dd5253c88 100644
--- a/test/createReport.m
+++ b/test/createReport.m
@@ -258,9 +258,9 @@ rep = rep.addSeries('graphHline', 460, ...
                     'graphLineWidth', 1.5);
 
 a=dseries([1:200]', '1984q1');
-b=a;
-c=a;
-d=a;
+b=copy(a);
+c=copy(a);
+d=copy(a);
 b(dates('2012q2'):dates('2015q2'))=b(dates('2012q2'):dates('2015q2'))+2;
 c(dates('2012q2'):dates('2015q2'))=c(dates('2012q2'):dates('2015q2'))+4;
 d(dates('2012q2'):dates('2015q2'))=d(dates('2012q2'):dates('2015q2'))+6;