diff --git a/crypto/bn/montgomery.c b/crypto/bn/montgomery.c
index 11edcbf..07e1a41 100644
--- a/crypto/bn/montgomery.c
+++ b/crypto/bn/montgomery.c
@@ -134,7 +134,6 @@
   memset(ret, 0, sizeof(BN_MONT_CTX));
   BN_init(&ret->RR);
   BN_init(&ret->N);
-  BN_init(&ret->Ni);
 
   return ret;
 }
@@ -146,7 +145,6 @@
 
   BN_free(&mont->RR);
   BN_free(&mont->N);
-  BN_free(&mont->Ni);
   OPENSSL_free(mont);
 }
 
@@ -156,8 +154,7 @@
   }
 
   if (!BN_copy(&to->RR, &from->RR) ||
-      !BN_copy(&to->N, &from->N) ||
-      !BN_copy(&to->Ni, &from->Ni)) {
+      !BN_copy(&to->N, &from->N)) {
     return NULL;
   }
   to->ri = from->ri;
diff --git a/include/openssl/bn.h b/include/openssl/bn.h
index 01115c8..cbc1ee7 100644
--- a/include/openssl/bn.h
+++ b/include/openssl/bn.h
@@ -836,10 +836,7 @@
 struct bn_mont_ctx_st {
   BIGNUM RR; /* used to convert to montgomery form */
   BIGNUM N;  /* The modulus */
-  BIGNUM Ni; /* R*(1/R mod N) - N*Ni = 1
-              * (Ni is only stored for bignum algorithm) */
-  BN_ULONG n0[2]; /* least significant word(s) of Ni;
-                     (type changed with 0.9.9, was "BN_ULONG n0;" before) */
+  BN_ULONG n0[2]; /* least significant words of (R*Ri-1)/N */
   int ri;    /* number of bits in R */
 };