diff --git a/sdk/include/psdk/propvarutil.h b/sdk/include/psdk/propvarutil.h
index 4dc3521a02c..ced51ec295f 100644
--- a/sdk/include/psdk/propvarutil.h
+++ b/sdk/include/psdk/propvarutil.h
@@ -77,6 +77,7 @@ HRESULT WINAPI PropVariantToUInt16(REFPROPVARIANT propvarIn, USHORT *ret);
 HRESULT WINAPI PropVariantToUInt32(REFPROPVARIANT propvarIn, ULONG *ret);
 HRESULT WINAPI PropVariantToUInt64(REFPROPVARIANT propvarIn, ULONGLONG *ret);
 HRESULT WINAPI PropVariantToBoolean(REFPROPVARIANT propvarIn, BOOL *ret);
+PCWSTR WINAPI PropVariantToStringWithDefault(REFPROPVARIANT propvarIn, LPCWSTR pszDefault);
 
 HRESULT WINAPI PropVariantToStringAlloc(REFPROPVARIANT propvarIn, WCHAR **ret);