diff --git a/reactos/dll/win32/advapi32/sec/misc.c b/reactos/dll/win32/advapi32/sec/misc.c
index 7bd77d6f7cc..67c3fc21469 100644
--- a/reactos/dll/win32/advapi32/sec/misc.c
+++ b/reactos/dll/win32/advapi32/sec/misc.c
@@ -1,6 +1,6 @@
 /*
  * COPYRIGHT:       See COPYING in the top level directory
- * WINE COPYRIGHT: 
+ * WINE COPYRIGHT:
  * Copyright 1999, 2000 Juergen Schmied <juergen.schmied@debitel.net>
  * Copyright 2003 CodeWeavers Inc. (Ulrich Czekalla)
  * Copyright 2006 Robert Reif
@@ -808,7 +808,7 @@ LookupAccountSidA(LPCSTR lpSystemName,
     /* allocate buffers for the unicode strings to receive */
     if (dwName > 0)
     {
-        NameBuffer = (PWSTR)LocalAlloc(LMEM_FIXED, dwName);
+        NameBuffer = LocalAlloc(LMEM_FIXED, dwName * sizeof(WCHAR));
         if (NameBuffer == NULL)
         {
             SetLastError(ERROR_OUTOFMEMORY);
@@ -820,7 +820,7 @@ LookupAccountSidA(LPCSTR lpSystemName,
 
     if (dwReferencedDomainName > 0)
     {
-        ReferencedDomainNameBuffer = (PWSTR)LocalAlloc(LMEM_FIXED, dwReferencedDomainName);
+        ReferencedDomainNameBuffer = LocalAlloc(LMEM_FIXED, dwReferencedDomainName * sizeof(WCHAR));
         if (ReferencedDomainNameBuffer == NULL)
         {
             if (dwName > 0)