diff --git a/reactos/include/psdk/intsafe.h b/reactos/include/psdk/intsafe.h
index 9654b5fc14a..ce64be8ec8d 100644
--- a/reactos/include/psdk/intsafe.h
+++ b/reactos/include/psdk/intsafe.h
@@ -328,7 +328,7 @@ DEFINE_SAFE_CONVERT_UTOX(ULongToUInt, ULONG, UINT)
 DEFINE_SAFE_CONVERT_UTOX(ULongToIntPtr, ULONG, INT_PTR)
 DEFINE_SAFE_CONVERT_UTOX(ULongToUIntPtr, ULONG, UINT_PTR)
 DEFINE_SAFE_CONVERT_UTOX(ULongToLongPtr, ULONG, LONG_PTR)
-DEFINE_SAFE_CONVERT_UTOX(ULongPtrToULong, ULONG_PTR, ULONGLONG)
+DEFINE_SAFE_CONVERT_UTOX(ULongPtrToULong, ULONG_PTR, ULONG)
 DEFINE_SAFE_CONVERT_UTOX(ULongLongToUInt, ULONGLONG, UINT)
 DEFINE_SAFE_CONVERT_UTOX(ULongLongToULong, ULONGLONG, ULONG)
 DEFINE_SAFE_CONVERT_UTOX(ULongLongToULongPtr, ULONGLONG, ULONG_PTR)