diff --git a/tests/script/tsim/parser/fourArithmetic-basic.sim b/tests/script/tsim/parser/fourArithmetic-basic.sim
index dde451279d..bd01813c61 100644
--- a/tests/script/tsim/parser/fourArithmetic-basic.sim
+++ b/tests/script/tsim/parser/fourArithmetic-basic.sim
@@ -94,7 +94,7 @@ endi
 if $data01 != 10.000000000 then
  return -1
 endi
-if $data02 != -nan then
+if $data02 != NULL then
  return -1
 endi
 if $data03 != -10.000000000 then