diff --git a/test/src/unit-udt.cpp b/test/src/unit-udt.cpp
index 6aa469fe4..409cac839 100644
--- a/test/src/unit-udt.cpp
+++ b/test/src/unit-udt.cpp
@@ -201,7 +201,7 @@ void from_json(const BasicJsonType& j, country& c)
     {
         {u8"中华人民共和国", country::china},
         {"France", country::france},
-        {"Российская Федерация", country::russia}
+        {u8"Российская Федерация", country::russia}
     };
 
     const auto it = m.find(str);