1 files changed, 1 insertions, 1 deletions

diff --git a/src/lib/libcrypto/bn/bn_word.c b/src/lib/libcrypto/bn/bn_word.c
index c0cfbc6797..73157a7d43 100644
--- a/src/lib/libcrypto/bn/bn_word.c
+++ b/src/lib/libcrypto/bn/bn_word.c
@@ -60,7 +60,7 @@
 #include "cryptlib.h"
 #include "bn_lcl.h"
 
-BN_ULONG BN_mod_word(BIGNUM *a, BN_ULONG w)
+BN_ULONG BN_mod_word(const BIGNUM *a, BN_ULONG w)
         {
 #ifndef BN_LLONG
         BN_ULONG ret=0;