diff --git a/crypto/bn/bn.h b/crypto/bn/bn.h
index ce2e746f6..1170465b1 100644
--- a/crypto/bn/bn.h
+++ b/crypto/bn/bn.h
@@ -456,7 +456,7 @@ int BN_mod_mul_montgomery(BIGNUM *r,const BIGNUM *a,const BIGNUM *b,
 int BN_from_montgomery(BIGNUM *r,const BIGNUM *a,
 	BN_MONT_CTX *mont, BN_CTX *ctx);
 void BN_MONT_CTX_free(BN_MONT_CTX *mont);
-int BN_MONT_CTX_set(BN_MONT_CTX *mont,const BIGNUM *modulus,BN_CTX *ctx);
+int BN_MONT_CTX_set(BN_MONT_CTX *mont,const BIGNUM *mod,BN_CTX *ctx);
 BN_MONT_CTX *BN_MONT_CTX_copy(BN_MONT_CTX *to,BN_MONT_CTX *from);
 
 BN_BLINDING *BN_BLINDING_new(BIGNUM *A,BIGNUM *Ai,BIGNUM *mod);