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-rw-r--r--generic/tclZlib.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/generic/tclZlib.c b/generic/tclZlib.c
index 47091de..ff887c8 100644
--- a/generic/tclZlib.c
+++ b/generic/tclZlib.c
@@ -3111,7 +3111,7 @@ ZlibTransformOutput(
e = deflate(&cd->outStream, Z_NO_FLUSH);
produced = cd->outAllocated - cd->outStream.avail_out;
- if (e == Z_OK && cd->outStream.avail_out > 0) {
+ if (e == Z_OK && produced > 0) {
if (Tcl_WriteRaw(cd->parent, cd->outBuffer, produced) < 0) {
*errorCodePtr = Tcl_GetErrno();
return -1;