1 files changed, 2 insertions, 2 deletions
diff --git a/src/rpc/blockchain.cpp b/src/rpc/blockchain.cpp
index 607262f770..701608e132 100644
--- a/src/rpc/blockchain.cpp
+++ b/src/rpc/blockchain.cpp
@@ -48,9 +48,9 @@ extern void TxToJSON(const CTransaction& tx, const uint256 hashBlock, UniValue&
 
 double GetDifficulty(const CBlockIndex* blockindex)
 {
-    if (blockindex == NULL)
+    if (blockindex == nullptr)
     {
-        if (chainActive.Tip() == NULL)
+        if (chainActive.Tip() == nullptr)
             return 1.0;
         else
             blockindex = chainActive.Tip();