1 files changed, 1 insertions, 1 deletions

diff --git a/src/lib/libcrypto/bn/bn_mpi.c b/src/lib/libcrypto/bn/bn_mpi.c
index 80e1dca6b7..05fa9d1e9a 100644
--- a/src/lib/libcrypto/bn/bn_mpi.c
+++ b/src/lib/libcrypto/bn/bn_mpi.c
@@ -88,7 +88,7 @@ int BN_bn2mpi(const BIGNUM *a, unsigned char *d)
         return(num+4+ext);
         }
 
-BIGNUM *BN_mpi2bn(unsigned char *d, int n, BIGNUM *a)
+BIGNUM *BN_mpi2bn(const unsigned char *d, int n, BIGNUM *a)
         {
         long len;
         int neg=0;