diff --git a/reactos/dll/directx/quartz/filtermapper.c b/reactos/dll/directx/quartz/filtermapper.c
index 7b8d95430bf..bacb72950d6 100644
--- a/reactos/dll/directx/quartz/filtermapper.c
+++ b/reactos/dll/directx/quartz/filtermapper.c
@@ -479,11 +479,16 @@ static HRESULT WINAPI FilterMapper2_UnregisterFilter(
 static HRESULT FM2_WriteFriendlyName(IPropertyBag * pPropBag, LPCWSTR szName)
 {
     VARIANT var;
+    HRESULT ret;
+    BSTR value;
 
     V_VT(&var) = VT_BSTR;
-    V_UNION(&var, bstrVal) = (BSTR)szName;
+    V_UNION(&var, bstrVal) = value = SysAllocString(szName);
 
-    return IPropertyBag_Write(pPropBag, wszFriendlyName, &var);
+    ret = IPropertyBag_Write(pPropBag, wszFriendlyName, &var);
+    SysFreeString(value);
+
+    return ret;
 }
 
 static HRESULT FM2_WriteClsid(IPropertyBag * pPropBag, REFCLSID clsid)