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-rw-r--r--ext/zlib/zlib.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/zlib/zlib.c b/ext/zlib/zlib.c
index c6c52b7454..636ec325ce 100644
--- a/ext/zlib/zlib.c
+++ b/ext/zlib/zlib.c
@@ -1293,6 +1293,7 @@ rb_deflate_params(VALUE obj, VALUE v_level, VALUE v_strategy)
level = ARG_LEVEL(v_level);
strategy = ARG_STRATEGY(v_strategy);
+ zstream_run(z, (Bytef*)"", 0, Z_SYNC_FLUSH);
err = deflateParams(&z->stream, level, strategy);
while (err == Z_BUF_ERROR) {
rb_warning("deflateParams() returned Z_BUF_ERROR");