diff --git a/unit_tests/regression.suite/list-plus-elem.lsl b/unit_tests/regression.suite/list-plus-elem.lsl
index 6aa7683..7ddffbf 100644
--- a/unit_tests/regression.suite/list-plus-elem.lsl
+++ b/unit_tests/regression.suite/list-plus-elem.lsl
@@ -1,6 +1,6 @@
 default{timer(){
 
-  list a;
+  list a = llGetPhysicsMaterial();
   integer b = llGetLinkNumber();
   a += 1;
   a += b;
@@ -23,4 +23,5 @@ default{timer(){
   a = (list)(list)(list)(list)(list)[b] + a;
   a = (list)(list)(list)(list)(list)1 + a;
   a = (list)(list)(list)(list)(list)b + a;
+  llParticleSystem(a);
 }}
diff --git a/unit_tests/regression.suite/list-plus-elem.out b/unit_tests/regression.suite/list-plus-elem.out
index 57a6ec9..f0e4e6a 100644
--- a/unit_tests/regression.suite/list-plus-elem.out
+++ b/unit_tests/regression.suite/list-plus-elem.out
@@ -2,7 +2,7 @@ default
 {
     timer()
     {
-        list a;
+        list a = llGetPhysicsMaterial();
         integer b = llGetLinkNumber();
         a = a + 1;
         a = a + b;
@@ -24,5 +24,6 @@ default
         a = b + a;
         a = 1 + a;
         a = b + a;
+        llParticleSystem(a);
     }
 }