diff --git a/blosc/fastcopy.c b/blosc/fastcopy.c
index 9ea0fd4e..2a1c0a0c 100644
--- a/blosc/fastcopy.c
+++ b/blosc/fastcopy.c
@@ -11,7 +11,7 @@
   The code in this file is heavily based on memcopy.h, from the
 
   zlib-ng compression library.  See LICENSES/ZLIB-NG.txt for details.
-  See also: https://github.com/zlib-ng/zlib-ng/blob/develop/zlib.h
+  See also: https://github.com/zlib-ng/zlib-ng/blob/develop/zlib.h.in
 
   New implementations by Francesc Alted:
     * fast_copy() and copy_run() functions