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-rw-r--r--generic/tclZlib.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/generic/tclZlib.c b/generic/tclZlib.c
index c231f44..96b8318 100644
--- a/generic/tclZlib.c
+++ b/generic/tclZlib.c
@@ -1204,10 +1204,10 @@ Tcl_ZlibStreamPut(
zshPtr->stream.avail_in = size;
/*
- * Must not do a zero-length compress. [Bug 25842c161]
+ * Must not do a zero-length compress unless finalizing. [Bug 25842c161]
*/
- if (size == 0) {
+ if (size == 0 && flush != Z_FINISH) {
return TCL_OK;
}