diff --git a/rostests/apitests/advapi32/HKEY_CLASSES_ROOT.c b/rostests/apitests/advapi32/HKEY_CLASSES_ROOT.c
index 636c2cd11cf..c65e76abbe1 100644
--- a/rostests/apitests/advapi32/HKEY_CLASSES_ROOT.c
+++ b/rostests/apitests/advapi32/HKEY_CLASSES_ROOT.c
@@ -60,8 +60,9 @@ GetKeyName(HKEY hKey, PUNICODE_STRING KeyName)
     Status = NtQueryKey(hKey, KeyNameInformation, NameInformation, InfoLength, &InfoLength);
     ok_ntstatus(Status, STATUS_SUCCESS);
 
-    RtlInitUnicodeString(&InfoName, NameInformation->Name);
+    InfoName.Buffer = NameInformation->Name;
     InfoName.Length = NameInformation->NameLength;
+    InfoName.MaximumLength = InfoName.Length;
 
     RtlDuplicateUnicodeString(RTL_DUPLICATE_UNICODE_STRING_NULL_TERMINATE, &InfoName, KeyName);