diff --git a/reactos/lib/advapi32/advapi32.def b/reactos/lib/advapi32/advapi32.def
index a5391b9a136..b15d67973a6 100644
--- a/reactos/lib/advapi32/advapi32.def
+++ b/reactos/lib/advapi32/advapi32.def
@@ -1,4 +1,4 @@
-; $Id: advapi32.def,v 1.23 2004/09/16 10:25:11 gvg Exp $
+; $Id: advapi32.def,v 1.24 2004/09/26 20:26:13 gvg Exp $
 ;
 ; advapi32.def
 ;
@@ -195,8 +195,8 @@ IsValidSid@4
 LockServiceDatabase@4
 LogonUserA@24
 LogonUserW@24
-;LookupAccountNameA@28
-;LookupAccountNameW@28
+LookupAccountNameA@28
+LookupAccountNameW@28
 LookupAccountSidA@28
 LookupAccountSidW@28
 LookupPrivilegeDisplayNameA@20
diff --git a/reactos/lib/advapi32/sec/misc.c b/reactos/lib/advapi32/sec/misc.c
index 7e0ce6e330a..9d12a5a8436 100644
--- a/reactos/lib/advapi32/sec/misc.c
+++ b/reactos/lib/advapi32/sec/misc.c
@@ -1,4 +1,4 @@
-/* $Id: misc.c,v 1.24 2004/09/08 11:36:24 ekohl Exp $
+/* $Id: misc.c,v 1.25 2004/09/26 20:26:13 gvg Exp $
  *
  * COPYRIGHT:       See COPYING in the top level directory
  * PROJECT:         ReactOS system libraries
@@ -574,6 +574,46 @@ LookupAccountSidW (LPCWSTR lpSystemName,
 }
 
 
+/******************************************************************************
+ * LookupAccountNameA [ADVAPI32.@]
+ *
+ * @unimplemented
+ */
+BOOL STDCALL
+LookupAccountNameA (LPCSTR SystemName,
+                    LPCSTR AccountName,
+		    PSID Sid,
+		    LPDWORD SidLength,
+		    LPSTR ReferencedDomainName,
+		    LPDWORD hReferencedDomainNameLength,
+		    PSID_NAME_USE SidNameUse)
+{
+  DPRINT1("LookupAccountNameA is unimplemented\n");
+  SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
+  return FALSE;
+}
+
+
+/******************************************************************************
+ * LookupAccountNameW [ADVAPI32.@]
+ *
+ * @unimplemented
+ */
+BOOL STDCALL
+LookupAccountNameW (LPCWSTR SystemName,
+                    LPCWSTR AccountName,
+		    PSID Sid,
+		    LPDWORD SidLength,
+		    LPWSTR ReferencedDomainName,
+		    LPDWORD hReferencedDomainNameLength,
+		    PSID_NAME_USE SidNameUse)
+{
+  DPRINT1("LookupAccountNameW is unimplemented\n");
+  SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
+  return FALSE;
+}
+
+
 /**********************************************************************
  * LookupPrivilegeValueA				EXPORTED
  *