diff --git a/src/util.pas b/src/util.pas
index 5c2e045e..2b3df0cb 100644
--- a/src/util.pas
+++ b/src/util.pas
@@ -143,7 +143,7 @@ begin
      asm
           PUSH EAX
           PUSH EDX
-          MOV DX, port$FFFF
+          MOV DX, port
           IN EAX, DX
           MOV inl, EAX
           POP EDX