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-rw-r--r--generic/tclIO.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/generic/tclIO.h b/generic/tclIO.h
index 15f0f78..d10f268 100644
--- a/generic/tclIO.h
+++ b/generic/tclIO.h
@@ -50,7 +50,7 @@ typedef struct ChannelBuffer {
* structure. */
} ChannelBuffer;
-#define CHANNELBUFFER_HEADER_SIZE TclOffset(ChannelBuffer, buf)
+#define CHANNELBUFFER_HEADER_SIZE offsetof(ChannelBuffer, buf)
/*
* How much extra space to allocate in buffer to hold bytes from previous