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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 c0f52c2..824dd13 100644
--- a/ext/zlib/zlib.c
+++ b/ext/zlib/zlib.c
@@ -1563,6 +1563,7 @@ rb_deflate_init_copy(VALUE self, VALUE orig)
Data_Get_Struct(self, struct zstream, z1);
z2 = get_zstream(orig);
+ if (z1 == z2) return self;
err = deflateCopy(&z1->stream, &z2->stream);
if (err != Z_OK) {
raise_zlib_error(err, 0);