diff --git a/dlls/shlwapi/regstream.c b/dlls/shlwapi/regstream.c
index 6aca8f937ef..5c0e5722b50 100644
--- a/dlls/shlwapi/regstream.c
+++ b/dlls/shlwapi/regstream.c
@@ -487,7 +487,7 @@ IStream * WINAPI SHOpenRegStreamW(HKEY hkey, LPCWSTR pszSubkey,
  *  A copy of the memory pointed to by lpbData is made, and is freed
  *  when the stream is released.
  */
-IStream * WINAPI SHCreateMemStream(LPBYTE lpbData, DWORD dwDataLen)
+IStream * WINAPI SHCreateMemStream(const BYTE *lpbData, UINT dwDataLen)
 {
   IStream *iStrmRet = NULL;