Reintroduce support for ZLIB_CONST in compat mode. (#704)

* Reintroduce support for ZLIB_CONST in compat mode.

1 files changed, 1 insertions, 1 deletions

diff --git a/uncompr.c b/uncompr.c
index 76844aa..1934ba3 100644
--- a/uncompr.c
+++ b/uncompr.c
@@ -43,7 +43,7 @@ int ZEXPORT PREFIX(uncompress2)(unsigned char *dest, z_size_t *destLen, const un
         dest = buf;
     }
 
-    stream.next_in = (const unsigned char *)source;
+    stream.next_in = (z_const unsigned char *)source;
     stream.avail_in = 0;
     stream.zalloc = NULL;
     stream.zfree = NULL;