diff --git a/src/protocol/codec/transport.c b/src/protocol/codec/transport.c
index 62a15d6f0..0cff46a78 100644
--- a/src/protocol/codec/transport.c
+++ b/src/protocol/codec/transport.c
@@ -434,7 +434,7 @@ z_result_t _z_fragment_encode(_z_wbuf_t *wbf, uint8_t header, const _z_t_msg_fra
     z_result_t ret = _Z_RES_OK;
     _Z_DEBUG("Encoding _Z_TRANSPORT_FRAGMENT");
     _Z_RETURN_IF_ERR(_z_zsize_encode(wbf, msg->_sn))
-    if (msg->first == true) {
+    if (msg->first) {
         if (_Z_HAS_FLAG(header, _Z_FLAG_T_Z) == true) {
             _Z_RETURN_IF_ERR(_z_uint8_encode(wbf, _Z_MSG_EXT_ID_FRAGMENT_FIRST | _Z_MSG_EXT_MORE(msg->drop)));
         } else {
@@ -442,7 +442,7 @@ z_result_t _z_fragment_encode(_z_wbuf_t *wbf, uint8_t header, const _z_t_msg_fra
             ret |= _Z_ERR_MESSAGE_SERIALIZATION_FAILED;
         }
     }
-    if (msg->drop == true) {
+    if (msg->drop) {
         if (_Z_HAS_FLAG(header, _Z_FLAG_T_Z) == true) {
             _Z_RETURN_IF_ERR(_z_uint8_encode(wbf, _Z_MSG_EXT_ID_FRAGMENT_DROP));
         } else {
diff --git a/src/protocol/definitions/transport.c b/src/protocol/definitions/transport.c
index 6332cff48..a332626e6 100644
--- a/src/protocol/definitions/transport.c
+++ b/src/protocol/definitions/transport.c
@@ -292,7 +292,7 @@ _z_transport_message_t _z_t_msg_make_fragment(_z_zint_t sn, _z_slice_t payload,
 
     msg._body._fragment._sn = sn;
     msg._body._fragment._payload = payload;
-    if (first == true || drop == true) {
+    if (first || drop) {
         _Z_SET_FLAG(msg._header, _Z_FLAG_T_Z);
     }
     msg._body._fragment.first = first;
diff --git a/src/transport/multicast/rx.c b/src/transport/multicast/rx.c
index 0e03a1e03..5a099558c 100644
--- a/src/transport/multicast/rx.c
+++ b/src/transport/multicast/rx.c
@@ -229,13 +229,13 @@ z_result_t _z_multicast_handle_transport_message(_z_transport_multicast_t *ztm,
             }
             // Handle fragment markers
             if (_Z_PATCH_HAS_FRAGMENT_MARKERS(entry->_patch)) {
-                if (t_msg->_body._fragment.first == true) {
+                if (t_msg->_body._fragment.first) {
                     _z_wbuf_clear(dbuf);
                 } else if (_z_wbuf_len(dbuf) == 0) {
                     _Z_DEBUG("First fragment received without the first marker");
                     break;
                 }
-                if (t_msg->_body._fragment.drop == true) {
+                if (t_msg->_body._fragment.drop) {
                     _z_wbuf_clear(dbuf);
                     break;
                 }
diff --git a/src/transport/unicast/rx.c b/src/transport/unicast/rx.c
index ad5b026e0..b737e7fa7 100644
--- a/src/transport/unicast/rx.c
+++ b/src/transport/unicast/rx.c
@@ -180,13 +180,13 @@ z_result_t _z_unicast_handle_transport_message(_z_transport_unicast_t *ztu, _z_t
             }
             // Handle fragment markers
             if (_Z_PATCH_HAS_FRAGMENT_MARKERS(ztu->_patch)) {
-                if (t_msg->_body._fragment.first == true) {
+                if (t_msg->_body._fragment.first) {
                     _z_wbuf_clear(dbuf);
                 } else if (_z_wbuf_len(dbuf) == 0) {
                     _Z_DEBUG("First fragment received without the start marker");
                     break;
                 }
-                if (t_msg->_body._fragment.drop == true) {
+                if (t_msg->_body._fragment.drop) {
                     _z_wbuf_clear(dbuf);
                     break;
                 }