From fe878b467d64ff975b42a2e42df250f0e8194e49 Mon Sep 17 00:00:00 2001
From: "jan.nijtmans" <nijtmans@users.sourceforge.net>
Date: Wed, 14 Feb 2024 16:05:41 +0000
Subject: offsetof -> TclOffset

---
 generic/tclIO.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/generic/tclIO.c b/generic/tclIO.c
index b8a79c2..349df68 100644
--- a/generic/tclIO.c
+++ b/generic/tclIO.c
@@ -9227,7 +9227,7 @@ TclCopyChannel(
      * completed.
      */
 
-    csPtr = (CopyState *)ckalloc(offsetof(CopyState, buffer) + 1U + !moveBytes * inStatePtr->bufSize);
+    csPtr = (CopyState *)ckalloc(TclOffset(CopyState, buffer) + 1U + !moveBytes * inStatePtr->bufSize);
     csPtr->bufSize = !moveBytes * inStatePtr->bufSize;
     csPtr->readPtr = inPtr;
     csPtr->writePtr = outPtr;
-- 
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