diff --git a/src/protocol/codec/ext.c b/src/protocol/codec/ext.c
index 8d99054b5..6ca7ecaee 100644
--- a/src/protocol/codec/ext.c
+++ b/src/protocol/codec/ext.c
@@ -167,8 +167,8 @@ int8_t _z_msg_ext_vec_decode(_z_msg_ext_vec_t *extensions, _z_zbuf_t *zbf) {
 }
 
 int8_t _z_msg_ext_unknown_error(_z_msg_ext_t *extension, uint8_t trace_id) {
-    uint8_t ext_id = _Z_EXT_ID(extension->_header);
 #if (ZENOH_DEBUG >= 1)
+    uint8_t ext_id = _Z_EXT_ID(extension->_header);
     switch (_Z_EXT_ENC(extension->_header)) {
         case _Z_MSG_EXT_ENC_UNIT: {
             _Z_ERROR("Unknown mandatory extension found (extension_id: %02x, trace_id: %02x), UNIT", ext_id, trace_id);
@@ -195,6 +195,9 @@ int8_t _z_msg_ext_unknown_error(_z_msg_ext_t *extension, uint8_t trace_id) {
                      trace_id);
         }
     }
+#else
+    _ZP_UNUSED(extension);
+    _ZP_UNUSED(trace_id);
 #endif
     return _Z_ERR_MESSAGE_EXTENSION_MANDATORY_AND_UNKNOWN;
 }
diff --git a/src/session/reply.c b/src/session/reply.c
index 7fcffc0e3..15cf19407 100644
--- a/src/session/reply.c
+++ b/src/session/reply.c
@@ -34,11 +34,12 @@ int8_t _z_trigger_reply_partial(_z_session_t *zn, _z_zint_t id, _z_keyexpr_t key
 int8_t _z_trigger_reply_final(_z_session_t *zn, _z_n_msg_response_final_t *final) {
     int8_t ret = _Z_RES_OK;
 
+#if Z_FEATURE_QUERY == 1
     // TODO check id to know where to dispatch
     _z_zint_t id = final->_request_id;
-
-#if Z_FEATURE_QUERY == 1
     _z_trigger_query_reply_final(zn, id);
+#else
+    _ZP_UNUSED(final);
 #endif
     return ret;
 }
diff --git a/src/session/rx.c b/src/session/rx.c
index 5ba2bc6ed..0428aef12 100644
--- a/src/session/rx.c
+++ b/src/session/rx.c
@@ -153,6 +153,7 @@ int8_t _z_handle_network_message(_z_session_t *zn, _z_zenoh_message_t *msg, uint
                     // @TODO: expose errors to the user
                     _z_msg_err_t error = response._body._err;
                     _z_bytes_t payload = error._ext_value.payload;
+                    _ZP_UNUSED(payload);  // Unused when logs are deactivated
                     _Z_ERROR("Received Err for query %zu: code=%d, message=%.*s", response._request_id, error._code,
                              (int)payload.len, payload.start);
                 } break;
diff --git a/src/transport/unicast/transport.c b/src/transport/unicast/transport.c
index 2c321f7a7..11e7467e6 100644
--- a/src/transport/unicast/transport.c
+++ b/src/transport/unicast/transport.c
@@ -122,7 +122,10 @@ int8_t _z_unicast_transport_create(_z_transport_t *zt, _z_link_t *zl, _z_transpo
             _z_wbuf_clear(&zt->_transport._unicast._wbuf);
             _z_zbuf_clear(&zt->_transport._unicast._zbuf);
         }
-#endif
+#else
+        _ZP_UNUSED(dbuf_size);
+        _ZP_UNUSED(expandable);
+#endif  // Z_FEATURE_FRAGMENTATION == 1
     }
 
     if (ret == _Z_RES_OK) {