diff --git a/src/zmq/zmqpublishnotifier.cpp b/src/zmq/zmqpublishnotifier.cpp
index f5839620ff227..a9ce9c48c4b55 100644
--- a/src/zmq/zmqpublishnotifier.cpp
+++ b/src/zmq/zmqpublishnotifier.cpp
@@ -9,6 +9,11 @@
 
 static std::multimap<std::string, CZMQAbstractPublishNotifier*> mapPublishNotifiers;
 
+static const char *MSG_HASHBLOCK = "hashblock";
+static const char *MSG_HASHTX    = "hashtx";
+static const char *MSG_RAWBLOCK  = "rawblock";
+static const char *MSG_RAWTX     = "rawtx";
+
 // Internal function to send multipart message
 static int zmq_send_multipart(void *sock, const void* data, size_t size, ...)
 {
@@ -125,7 +130,7 @@ bool CZMQPublishHashBlockNotifier::NotifyBlock(const CBlockIndex *pindex)
     char data[32];
     for (unsigned int i = 0; i < 32; i++)
         data[31 - i] = hash.begin()[i];
-    int rc = zmq_send_multipart(psocket, "hashblock", 9, data, 32, 0);
+    int rc = zmq_send_multipart(psocket, MSG_HASHBLOCK, 9, data, 32, 0);
     return rc == 0;
 }
 
@@ -136,7 +141,7 @@ bool CZMQPublishHashTransactionNotifier::NotifyTransaction(const CTransaction &t
     char data[32];
     for (unsigned int i = 0; i < 32; i++)
         data[31 - i] = hash.begin()[i];
-    int rc = zmq_send_multipart(psocket, "hashtx", 6, data, 32, 0);
+    int rc = zmq_send_multipart(psocket, MSG_HASHTX, 6, data, 32, 0);
     return rc == 0;
 }
 
@@ -158,7 +163,7 @@ bool CZMQPublishRawBlockNotifier::NotifyBlock(const CBlockIndex *pindex)
         ss << block;
     }
 
-    int rc = zmq_send_multipart(psocket, "rawblock", 8, &(*ss.begin()), ss.size(), 0);
+    int rc = zmq_send_multipart(psocket, MSG_RAWBLOCK, 8, &(*ss.begin()), ss.size(), 0);
     return rc == 0;
 }
 
@@ -168,6 +173,6 @@ bool CZMQPublishRawTransactionNotifier::NotifyTransaction(const CTransaction &tr
     LogPrint("zmq", "zmq: Publish rawtx %s\n", hash.GetHex());
     CDataStream ss(SER_NETWORK, PROTOCOL_VERSION);
     ss << transaction;
-    int rc = zmq_send_multipart(psocket, "rawtx", 5, &(*ss.begin()), ss.size(), 0);
+    int rc = zmq_send_multipart(psocket, MSG_RAWTX, 5, &(*ss.begin()), ss.size(), 0);
     return rc == 0;
 }