1 files changed, 1 insertions, 1 deletions

diff --git a/src/lib/libcrypto/buffer/buffer.h b/src/lib/libcrypto/buffer/buffer.h
index 178e418282..f8da32b485 100644
--- a/src/lib/libcrypto/buffer/buffer.h
+++ b/src/lib/libcrypto/buffer/buffer.h
@@ -88,7 +88,7 @@ int	BUF_MEM_grow_clean(BUF_MEM *str, size_t len);
 char *  BUF_strdup(const char *str);
 char *  BUF_strndup(const char *str, size_t siz);
 void *  BUF_memdup(const void *data, size_t siz);
-void    BUF_reverse(unsigned char *out, unsigned char *in, size_t siz);
+void    BUF_reverse(unsigned char *out, const unsigned char *in, size_t siz);
 
 /* safe string functions */
 size_t BUF_strlcpy(char *dst,const char *src,size_t siz);