1 files changed, 1 insertions, 0 deletions
diff --git a/ext/zlib/zlib.c b/ext/zlib/zlib.c
index c253b94d95..223879c2dc 100644
--- a/ext/zlib/zlib.c
+++ b/ext/zlib/zlib.c
@@ -2293,6 +2293,7 @@ static void
 gzfile_reset(struct gzfile *gz)
 {
     zstream_reset(&gz->z);
+    gz->z.flags |= ZSTREAM_FLAG_GZFILE;
     gz->crc = crc32(0, Z_NULL, 0);
     gz->lineno = 0;
     gz->ungetc = 0;