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-rw-r--r--ext/zlib/zlib.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/zlib/zlib.c b/ext/zlib/zlib.c
index ffc566197c..c7ca55cc1b 100644
--- a/ext/zlib/zlib.c
+++ b/ext/zlib/zlib.c
@@ -695,7 +695,7 @@ zstream_run(struct zstream *z, Bytef *src, uInt len, int flush)
{
uInt n;
int err;
- volatile VALUE guard;
+ volatile VALUE guard = Qnil;
if (NIL_P(z->input) && len == 0) {
z->stream.next_in = (Bytef*)"";