1 files changed, 4 insertions, 2 deletions

diff --git a/src/lib/libcrypto/asn1/x_bignum.c b/src/lib/libcrypto/asn1/x_bignum.c
index 848c7a0877..869c05d931 100644
--- a/src/lib/libcrypto/asn1/x_bignum.c
+++ b/src/lib/libcrypto/asn1/x_bignum.c
@@ -59,6 +59,7 @@
 #include <stdio.h>
 #include "cryptlib.h"
 #include <openssl/asn1t.h>
+#include <openssl/bn.h>
 
 /* Custom primitive type for BIGNUM handling. This reads in an ASN1_INTEGER as a
  * BIGNUM directly. Currently it ignores the sign which isn't a problem since all
@@ -72,7 +73,7 @@ static int bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it);
 static void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it);
 
 static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it);
-static int bn_c2i(ASN1_VALUE **pval, unsigned char *cont, int len, int utype, char *free_cont, const ASN1_ITEM *it);
+static int bn_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, int utype, char *free_cont, const ASN1_ITEM *it);
 
 static ASN1_PRIMITIVE_FUNCS bignum_pf = {
         NULL, 0,
@@ -122,7 +123,8 @@ static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN
         return pad + BN_num_bytes(bn);
 }
 
-static int bn_c2i(ASN1_VALUE **pval, unsigned char *cont, int len, int utype, char *free_cont, const ASN1_ITEM *it)
+static int bn_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
+                  int utype, char *free_cont, const ASN1_ITEM *it)
 {
         BIGNUM *bn;
         if(!*pval) bn_new(pval, it);