diff --git a/src/zmq/zmqpublishnotifier.cpp b/src/zmq/zmqpublishnotifier.cpp
--- a/src/zmq/zmqpublishnotifier.cpp
+++ b/src/zmq/zmqpublishnotifier.cpp
@@ -189,7 +189,7 @@
     BlockHash hash = pindex->GetBlockHash();
     LogPrint(BCLog::ZMQ, "zmq: Publish hashblock %s to %s\n", hash.GetHex(),
              this->address);
-    char data[32];
+    uint8_t data[32];
     for (unsigned int i = 0; i < 32; i++) {
         data[31 - i] = hash.begin()[i];
     }
@@ -201,7 +201,7 @@
     TxId txid = transaction.GetId();
     LogPrint(BCLog::ZMQ, "zmq: Publish hashtx %s to %s\n", txid.GetHex(),
              this->address);
-    char data[32];
+    uint8_t data[32];
     for (unsigned int i = 0; i < 32; i++) {
         data[31 - i] = txid.begin()[i];
     }
diff --git a/test/sanitizer_suppressions/ubsan b/test/sanitizer_suppressions/ubsan
--- a/test/sanitizer_suppressions/ubsan
+++ b/test/sanitizer_suppressions/ubsan
@@ -56,7 +56,6 @@
 implicit-integer-sign-change:test/streams_tests.cpp
 implicit-integer-sign-change:test/transaction_tests.cpp
 implicit-integer-sign-change:txmempool.cpp
-implicit-integer-sign-change:zmq/zmqpublishnotifier.cpp
 implicit-signed-integer-truncation,implicit-integer-sign-change:test/skiplist_tests.cpp
 implicit-signed-integer-truncation:crypto/*
 implicit-signed-integer-truncation:leveldb/*