diff --git a/test/src/unit-class_parser.cpp b/test/src/unit-class_parser.cpp
index b6d6a6157..775952b92 100644
--- a/test/src/unit-class_parser.cpp
+++ b/test/src/unit-class_parser.cpp
@@ -761,7 +761,7 @@ TEST_CASE("parser class")
 
         SECTION("from array")
         {
-            uint8_t v[] = {'t', 'r', 'u', 'e'};
+            uint8_t v[] = {'t', 'r', 'u', 'e', '\0'};
             CHECK(json::parser(std::begin(v), std::end(v)).parse() == json(true));
         }
 
diff --git a/test/src/unit-deserialization.cpp b/test/src/unit-deserialization.cpp
index 0e5e21229..965d1d075 100644
--- a/test/src/unit-deserialization.cpp
+++ b/test/src/unit-deserialization.cpp
@@ -96,7 +96,7 @@ TEST_CASE("deserialization")
 
         SECTION("from array")
         {
-            uint8_t v[] = {'t', 'r', 'u', 'e'};
+            uint8_t v[] = {'t', 'r', 'u', 'e', '\0'};
             CHECK(json::parse(std::begin(v), std::end(v)) == json(true));
         }