diff --git a/client.cpp b/client.cpp
index d9683cd..35fef94 100644
--- a/client.cpp
+++ b/client.cpp
@@ -277,9 +277,9 @@ bool Client::writeBufIntoFd()
 
 std::string Client::repr()
 {
-    std::string s = formatString("[ClientID='%s', username='%s', fd=%d, keepalive=%ds, transport='%s', address='%s', cleanses=%d]",
+    std::string s = formatString("[ClientID='%s', username='%s', fd=%d, keepalive=%ds, transport='%s', address='%s', cleanses=%d, prot=%s]",
                                  clientid.c_str(), username.c_str(), fd, keepalive, this->transportStr.c_str(), this->address.c_str(),
-                                 cleanSession);
+                                 cleanSession, protocolVersionString(protocolVersion).c_str());
     return s;
 }
 
diff --git a/utils.cpp b/utils.cpp
index 1cf4428..8ce6334 100644
--- a/utils.cpp
+++ b/utils.cpp
@@ -651,3 +651,18 @@ const std::string websocketCloseCodeToString(uint16_t code)
         return formatString("Websocket status code %d", code);
     }
 }
+
+const std::string protocolVersionString(ProtocolVersion p)
+{
+    switch (p)
+    {
+    case ProtocolVersion::None:
+        return "none";
+    case ProtocolVersion::Mqtt31:
+        return "3.1";
+    case ProtocolVersion::Mqtt311:
+        return "3.1.1";
+    default:
+        return "unknown";
+    }
+}
diff --git a/utils.h b/utils.h
index cef7f41..746c433 100644
--- a/utils.h
+++ b/utils.h
@@ -33,6 +33,7 @@ License along with FlashMQ. If not, see <https://www.gnu.org/licenses/>.
 
 #include "cirbuf.h"
 #include "bindaddr.h"
+#include "types.h"
 
 template<typename T> int check(int rc)
 {
@@ -124,5 +125,7 @@ template<typename ex> void checkWritableDir(const std::string &path)
 
 const std::string websocketCloseCodeToString(uint16_t code);
 
+const std::string protocolVersionString(ProtocolVersion p);
+
 
 #endif // UTILS_H