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-rw-r--r--zlib/infback.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/zlib/infback.c b/zlib/infback.c
index 981aff17c2d..f3833c2e434 100644
--- a/zlib/infback.c
+++ b/zlib/infback.c
@@ -255,7 +255,7 @@ out_func out;
void FAR *out_desc;
{
struct inflate_state FAR *state;
- unsigned char FAR *next; /* next input */
+ z_const unsigned char FAR *next; /* next input */
unsigned char FAR *put; /* next output */
unsigned have, left; /* available input and output */
unsigned long hold; /* bit buffer */