diff --git a/reactos/lib/ntdll/def/ntdll.def b/reactos/lib/ntdll/def/ntdll.def
index 885dbe27963..9a4b99fe1d7 100644
--- a/reactos/lib/ntdll/def/ntdll.def
+++ b/reactos/lib/ntdll/def/ntdll.def
@@ -1,4 +1,4 @@
-; $Id: ntdll.def,v 1.134 2004/11/12 12:06:54 ekohl Exp $
+; $Id: ntdll.def,v 1.135 2004/12/05 21:16:01 navaraf Exp $
 ;
 ; ReactOS Operating System
 ;
@@ -487,6 +487,7 @@ RtlInitCodePageTable@8
 RtlInitNlsTables@16
 RtlInitString@8
 RtlInitUnicodeString@8
+RtlInitUnicodeStringEx@8
 ;RtlInitializeAtomPackage
 RtlInitializeBitMap@12
 RtlInitializeContext@20
diff --git a/reactos/lib/rtl/unicode.c b/reactos/lib/rtl/unicode.c
index 1d113030b52..77cad08b586 100644
--- a/reactos/lib/rtl/unicode.c
+++ b/reactos/lib/rtl/unicode.c
@@ -497,6 +497,29 @@ RtlInitUnicodeString(IN OUT PUNICODE_STRING DestinationString,
    DestinationString->Buffer = (PWSTR)SourceString;
 }
 
+/*
+ * @implemented
+ */
+NTSTATUS STDCALL
+RtlInitUnicodeStringEx(OUT PUNICODE_STRING DestinationString,
+                       IN PCWSTR SourceString)
+{
+   ULONG Length = 0;
+
+   if (SourceString != NULL)
+   {
+      Length = wcslen(SourceString) * sizeof(WCHAR);
+      if (Length > 0xFFFC)
+         return STATUS_NAME_TOO_LONG;
+   }
+
+   DestinationString->Length = Length;
+   DestinationString->MaximumLength = Length + sizeof(WCHAR);
+   DestinationString->Buffer = (PWSTR)SourceString;
+
+   return STATUS_SUCCESS;
+}
+
 /*
  * @implemented
  *