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-rw-r--r--compress.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/compress.c b/compress.c
index ea4dfbe9d7b3..6e9762676a0d 100644
--- a/compress.c
+++ b/compress.c
@@ -29,7 +29,7 @@ int ZEXPORT compress2 (dest, destLen, source, sourceLen, level)
z_stream stream;
int err;
- stream.next_in = (Bytef*)source;
+ stream.next_in = (z_const Bytef *)source;
stream.avail_in = (uInt)sourceLen;
#ifdef MAXSEG_64K
/* Check for source > 64K on 16-bit machine: */