diff --git a/nse_openssl.cc b/nse_openssl.cc
index 81c85985d..a51fbb212 100644
--- a/nse_openssl.cc
+++ b/nse_openssl.cc
@@ -142,21 +142,6 @@ static int l_bignum_is_bit_set( lua_State *L ) /** bignum_set_bit( BIGNUM bn, nu
   return 1;
 }
 
-static int l_bignum_set_negative( lua_State *L ) /** bignum_set_negative( BIGNUM bn ) */
-{
-  bignum_data_t * userdata = (bignum_data_t *) luaL_checkudata(L, 1, "BIGNUM");
-  int value = lua_toboolean(L, 2);
-  BN_set_negative( userdata->bn, value );
-  return 0;
-}
-
-static int l_bignum_is_negative( lua_State *L ) /** bignum_is_negative( BIGNUM bn ) */
-{
-  bignum_data_t * userdata = (bignum_data_t *) luaL_checkudata(L, 1, "BIGNUM");
-  lua_pushboolean( L, BN_is_negative( userdata->bn) );
-  return 1;
-}
-
 static int l_bignum_bn2bin( lua_State *L ) /** bignum_bn2bin( BIGNUM bn ) */
 {
   bignum_data_t * userdata = (bignum_data_t *) luaL_checkudata(L, 1, "BIGNUM");
@@ -460,8 +445,6 @@ static const struct luaL_reg bignum_methods[] = {
   { "set_bit", l_bignum_set_bit },
   { "clear_bit", l_bignum_clear_bit },
   { "is_bit_set", l_bignum_is_bit_set },
-  { "set_negative", l_bignum_set_negative },
-  { "is_negative", l_bignum_is_negative },
   { "__gc", l_bignum_free },
   { NULL, NULL }
 };
@@ -472,8 +455,6 @@ static const struct luaL_reg openssllib[] = {
   { "bignum_set_bit", l_bignum_set_bit },
   { "bignum_clear_bit", l_bignum_clear_bit },
   { "bignum_is_bit_set", l_bignum_is_bit_set },
-  { "bignum_set_negative", l_bignum_set_negative },
-  { "bignum_is_negative", l_bignum_is_negative },
   { "bignum_bin2bn", l_bignum_bin2bn },
   { "bignum_dec2bn", l_bignum_dec2bn },
   { "bignum_hex2bn", l_bignum_hex2bn },
diff --git a/nselib/openssl.luadoc b/nselib/openssl.luadoc
index 6d5bc2bd8..b229bda1a 100644
--- a/nselib/openssl.luadoc
+++ b/nselib/openssl.luadoc
@@ -47,17 +47,6 @@ function bignum_clear_bit(bignum, position)
 -- @return True if the selected bit is set, false otherwise. 
 function bignum_is_bit_set(bignum, position)
 
---- Sets the sign of <code>bignum</code>.
--- @param bignum bignum to operate on.
--- @param negative If true, the sign becomes negative, otherwise it becomes
--- positive.
-function bignum_set_negative(bignum, negative)
-
---- Gets the sign of <code>bignum</code>.
--- @param bignum bignum to operate on.
--- @return True if <code>bignum</code> is negative, false otherwise.
-function bignum_is_negative(bignum)
-
 --- Converts a binary-encoded string into a bignum.
 -- @param string Binary string.
 -- @return bignum.