zmq: Fix implicit-integer-sign-change

1 files changed, 6 insertions, 4 deletions

diff --git a/src/zmq/zmqpublishnotifier.cpp b/src/zmq/zmqpublishnotifier.cpp
index 543db10612..2c6f24a239 100644
--- a/src/zmq/zmqpublishnotifier.cpp
+++ b/src/zmq/zmqpublishnotifier.cpp
@@ -209,9 +209,10 @@ bool CZMQPublishHashBlockNotifier::NotifyBlock(const CBlockIndex *pindex)
 {
     uint256 hash = pindex->GetBlockHash();
     LogPrint(BCLog::ZMQ, "zmq: Publish hashblock %s to %s\n", hash.GetHex(), this->address);
-    char data[32];
-    for (unsigned int i = 0; i < 32; i++)
+    uint8_t data[32];
+    for (unsigned int i = 0; i < 32; i++) {
         data[31 - i] = hash.begin()[i];
+    }
     return SendZmqMessage(MSG_HASHBLOCK, data, 32);
 }
 
@@ -219,9 +220,10 @@ bool CZMQPublishHashTransactionNotifier::NotifyTransaction(const CTransaction &t
 {
     uint256 hash = transaction.GetHash();
     LogPrint(BCLog::ZMQ, "zmq: Publish hashtx %s to %s\n", hash.GetHex(), this->address);
-    char data[32];
-    for (unsigned int i = 0; i < 32; i++)
+    uint8_t data[32];
+    for (unsigned int i = 0; i < 32; i++) {
         data[31 - i] = hash.begin()[i];
+    }
     return SendZmqMessage(MSG_HASHTX, data, 32);
 }