1 files changed, 6 insertions, 1 deletions
diff --git a/src/key.cpp b/src/key.cpp
index 652041f4fb..10b6668aae 100644
--- a/src/key.cpp
+++ b/src/key.cpp
@@ -5,7 +5,6 @@
 
 #include <key.h>
 
-#include <arith_uint256.h>
 #include <crypto/common.h>
 #include <crypto/hmac_sha512.h>
 #include <random.h>
@@ -163,6 +162,12 @@ void CKey::MakeNewKey(bool fCompressedIn) {
     fCompressed = fCompressedIn;
 }
 
+bool CKey::Negate()
+{
+    assert(fValid);
+    return secp256k1_ec_privkey_negate(secp256k1_context_sign, keydata.data());
+}
+
 CPrivKey CKey::GetPrivKey() const {
     assert(fValid);
     CPrivKey privkey;