diff --git a/samples/Mathematica/TestString.mt b/samples/Mathematica/TestString.mt
index c0d61036..20539407 100644
--- a/samples/Mathematica/TestString.mt
+++ b/samples/Mathematica/TestString.mt
@@ -1 +1 @@
-Test[1"a" <> "b", "ab", TestID -> "Concat \"a\" and \"b\""]
+Test["a" <> "b", "ab", TestID -> "Concat \"a\" and \"b\""]