1 files changed, 3 insertions, 2 deletions

diff --git a/src/lib/libcrypto/rc2/rc2cfb64.c b/src/lib/libcrypto/rc2/rc2cfb64.c
index 5e3fa07d90..b3a0158a6e 100644
--- a/src/lib/libcrypto/rc2/rc2cfb64.c
+++ b/src/lib/libcrypto/rc2/rc2cfb64.c
@@ -64,8 +64,9 @@
  * 64bit block we have used is contained in *num;
  */
 
-void RC2_cfb64_encrypt(unsigned char *in, unsigned char *out, long length,
-             RC2_KEY *schedule, unsigned char *ivec, int *num, int encrypt)
+void RC2_cfb64_encrypt(const unsigned char *in, unsigned char *out,
+                       long length, RC2_KEY *schedule, unsigned char *ivec,
+                       int *num, int encrypt)
         {
         register unsigned long v0,v1,t;
         register int n= *num;