diff --git a/dlls/shlwapi/ordinal.c b/dlls/shlwapi/ordinal.c
index 8c9e324ae0f..e73ba6efa7b 100644
--- a/dlls/shlwapi/ordinal.c
+++ b/dlls/shlwapi/ordinal.c
@@ -3372,7 +3372,7 @@ HRESULT WINAPI CLSIDFromStringWrap(LPCWSTR idstr, CLSID *id)
  */
 HRESULT WINAPI SHLoadRegUIStringW(HKEY hkey, LPCWSTR value, LPWSTR buf, DWORD size)
 {
-    DWORD type, sz = size;
+    DWORD type, sz = size * sizeof(WCHAR);
 
     if(RegQueryValueExW(hkey, value, NULL, &type, (LPBYTE)buf, &sz) != ERROR_SUCCESS)
         return E_FAIL;