1 files changed, 3 insertions, 2 deletions

diff --git a/src/lib/libcrypto/mdc2/mdc2.h b/src/lib/libcrypto/mdc2/mdc2.h
index ec8e159fc9..00acd707cd 100644
--- a/src/lib/libcrypto/mdc2/mdc2.h
+++ b/src/lib/libcrypto/mdc2/mdc2.h
@@ -82,9 +82,10 @@ typedef struct mdc2_ctx_st
 
 
 void MDC2_Init(MDC2_CTX *c);
-void MDC2_Update(MDC2_CTX *c, unsigned char *data, unsigned long len);
+void MDC2_Update(MDC2_CTX *c, const unsigned char *data, unsigned long len);
 void MDC2_Final(unsigned char *md, MDC2_CTX *c);
-unsigned char *MDC2(unsigned char *d, unsigned long n, unsigned char *md);
+unsigned char *MDC2(const unsigned char *d, unsigned long n,
+        unsigned char *md);
 
 #ifdef  __cplusplus
 }