diff --git a/mqttpacket.cpp b/mqttpacket.cpp
index 82b29b3..1bdac97 100644
--- a/mqttpacket.cpp
+++ b/mqttpacket.cpp
@@ -400,9 +400,11 @@ void MqttPacket::handleConnect()
                     break;
                 case Mqtt5Properties::RequestResponseInformation:
                     request_response_information = !!readByte();
+                    UNUSED(request_response_information);
                     break;
                 case Mqtt5Properties::RequestProblemInformation:
                     request_problem_information = !!readByte();
+                    UNUSED(request_problem_information);
                     break;
                 case Mqtt5Properties::UserProperty:
                     readUserProperty();
diff --git a/utils.h b/utils.h
index f99b34a..ddc68bc 100644
--- a/utils.h
+++ b/utils.h
@@ -35,6 +35,8 @@ License along with FlashMQ. If not, see <https://www.gnu.org/licenses/>.
 #include "bindaddr.h"
 #include "types.h"
 
+#define UNUSED(expr) do { (void)(expr); } while (0)
+
 template<typename T> int check(int rc)
 {
     if (rc < 0)