diff --git a/packages/rtl-extra/src/inc/objects.pp b/packages/rtl-extra/src/inc/objects.pp
index 7a21de7315..c138b148a0 100644
--- a/packages/rtl-extra/src/inc/objects.pp
+++ b/packages/rtl-extra/src/inc/objects.pp
@@ -1013,7 +1013,7 @@ TYPE
    PVMT=^VMT;
    PPVMT=^PVMT;
    VMT=RECORD
-     Size,NegSize:Longint;
+     Size,NegSize:SizeInt;
      ParentLink:PPVMT;
    END;
 VAR SP:PPVMT; Q:PVMT;