1 files changed, 3 insertions, 2 deletions

diff --git a/src/lib/libcrypto/rc2/rc2ofb64.c b/src/lib/libcrypto/rc2/rc2ofb64.c
index 42cdd40cdd..9e297867ed 100644
--- a/src/lib/libcrypto/rc2/rc2ofb64.c
+++ b/src/lib/libcrypto/rc2/rc2ofb64.c
@@ -63,8 +63,9 @@
  * used.  The extra state information to record how much of the
  * 64bit block we have used is contained in *num;
  */
-void RC2_ofb64_encrypt(unsigned char *in, unsigned char *out, long length,
-             RC2_KEY *schedule, unsigned char *ivec, int *num)
+void RC2_ofb64_encrypt(const unsigned char *in, unsigned char *out,
+                       long length, RC2_KEY *schedule, unsigned char *ivec,
+                       int *num)
         {
         register unsigned long v0,v1,t;
         register int n= *num;