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-rw-r--r--generic/tclIO.c2
1 files changed, 1 insertions, 1 deletions
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;