diff --git a/tests/particle/benchmark.m b/tests/particle/benchmark.m
index 6531fa3bca537185b504c8e278b3e01b878e3964..99a99cb64ee7740c00d4c72fcb5f52d7eb632d2d 100644
--- a/tests/particle/benchmark.m
+++ b/tests/particle/benchmark.m
@@ -155,4 +155,4 @@ y = series(:,1) + 0.00158*randn(size(series(:,1)));
 l = series(:,2) + 0.0011*randn(size(series(:,2)));
 i = series(:,3) + 0.000866*randn(size(series(:,3)));
 
-ti = [1950:0.25:1997.75] ;
\ No newline at end of file
+clear series;
\ No newline at end of file
diff --git a/tests/particle/extreme.m b/tests/particle/extreme.m
index c6a7dba26e612eadb4cd10bbce51b978cf5d3a2c..bb09194577d88f684b68877d3412d2445adfd1cc 100644
--- a/tests/particle/extreme.m
+++ b/tests/particle/extreme.m
@@ -155,4 +155,4 @@ y = series(:,1) + 0.00158*randn(size(series(:,1)));
 l = series(:,2) + 0.0011*randn(size(series(:,2)));
 i = series(:,3) + 0.000866*randn(size(series(:,3)));
 
-ti = [1950:0.25:1997.75] ;
\ No newline at end of file
+clear series;
\ No newline at end of file
diff --git a/tests/particle/risky.m b/tests/particle/risky.m
index 4d0b7a829971b6f2f937d3c4a47f9b3d31a6992a..0eb2f020686b4ff6dc30e5822de3e3aef896bf16 100644
--- a/tests/particle/risky.m
+++ b/tests/particle/risky.m
@@ -155,4 +155,4 @@ y = series(:,1) + 0.0175*randn(size(series(:,1)));
 l = series(:,2) + 0.00312*randn(size(series(:,2)));
 i = series(:,3) + 0.00465*randn(size(series(:,3)));
 
-ti = [1950:0.25:1997.75] ;
\ No newline at end of file
+clear series;
\ No newline at end of file