diff --git a/rtl/inc/systemh.inc b/rtl/inc/systemh.inc
index 5a3350bb3b..ca4896d9ce 100644
--- a/rtl/inc/systemh.inc
+++ b/rtl/inc/systemh.inc
@@ -509,6 +509,7 @@ Type
   PCardinal           = ^Cardinal;
   PQWord              = ^QWord;
   PInt64              = ^Int64;
+  PUInt64             = ^UInt64;
   PPtrInt             = ^PtrInt;
   PPtrUInt            = ^PtrUInt;
   PSizeInt            = ^SizeInt;