diff --git a/test/src/unit-class_parser.cpp b/test/src/unit-class_parser.cpp
index 35a76c10..c7429dd4 100644
--- a/test/src/unit-class_parser.cpp
+++ b/test/src/unit-class_parser.cpp
@@ -749,7 +749,7 @@ TEST_CASE("parser class")
     {
         SECTION("from std::vector")
         {
-            std::vector<uint8_t> v = {'t', 'r', 'u', 'e'};
+            std::vector<uint8_t> v = {'t', 'r', 'u', 'e', '\0'};
             CHECK (json::parser(std::begin(v), std::end(v)).parse() == json(true));
         }