diff --git a/app/test-eventdev/test_order_atq.c b/app/test-eventdev/test_order_atq.c
index cfcb1dc4e9..71215a07b6 100644
--- a/app/test-eventdev/test_order_atq.c
+++ b/app/test-eventdev/test_order_atq.c
@@ -35,7 +35,7 @@ order_atq_worker(void *arg, const bool flow_id_cap)
 		}
 
 		if (!flow_id_cap)
-			ev.flow_id = ev.mbuf->udata64;
+			order_flow_id_copy_from_mbuf(t, &ev);
 
 		if (ev.sub_event_type == 0) { /* stage 0 from producer */
 			order_atq_process_stage_0(&ev);
@@ -72,7 +72,7 @@ order_atq_worker_burst(void *arg, const bool flow_id_cap)
 
 		for (i = 0; i < nb_rx; i++) {
 			if (!flow_id_cap)
-				ev[i].flow_id = ev[i].mbuf->udata64;
+				order_flow_id_copy_from_mbuf(t, &ev[i]);
 
 			if (ev[i].sub_event_type == 0) { /*stage 0 */
 				order_atq_process_stage_0(&ev[i]);
diff --git a/app/test-eventdev/test_order_common.c b/app/test-eventdev/test_order_common.c
index dc55d93921..01a44bcd75 100644
--- a/app/test-eventdev/test_order_common.c
+++ b/app/test-eventdev/test_order_common.c
@@ -46,13 +46,10 @@ order_producer(void *arg)
 		if (m == NULL)
 			continue;
 
-		const uint32_t flow = (uintptr_t)m % nb_flows;
+		const flow_id_t flow = (uintptr_t)m % nb_flows;
 		/* Maintain seq number per flow */
 		m->seqn = producer_flow_seq[flow]++;
-		m->udata64 = flow;
-
-		ev.flow_id = flow;
-		ev.mbuf = m;
+		order_flow_id_save(t, flow, m, &ev);
 
 		while (rte_event_enqueue_burst(dev_id, port, &ev, 1) != 1) {
 			if (t->err)
@@ -138,6 +135,12 @@ int
 order_test_setup(struct evt_test *test, struct evt_options *opt)
 {
 	void *test_order;
+	struct test_order *t;
+	static const struct rte_mbuf_dynfield flow_id_dynfield_desc = {
+		.name = "test_event_dynfield_flow_id",
+		.size = sizeof(flow_id_t),
+		.align = __alignof__(flow_id_t),
+	};
 
 	test_order = rte_zmalloc_socket(test->name, sizeof(struct test_order),
 				RTE_CACHE_LINE_SIZE, opt->socket_id);
@@ -146,8 +149,14 @@ order_test_setup(struct evt_test *test, struct evt_options *opt)
 		goto nomem;
 	}
 	test->test_priv = test_order;
+	t = evt_test_priv(test);
 
-	struct test_order *t = evt_test_priv(test);
+	t->flow_id_dynfield_offset =
+		rte_mbuf_dynfield_register(&flow_id_dynfield_desc);
+	if (t->flow_id_dynfield_offset < 0) {
+		evt_err("failed to register mbuf field");
+		return -rte_errno;
+	}
 
 	t->producer_flow_seq = rte_zmalloc_socket("test_producer_flow_seq",
 				 sizeof(*t->producer_flow_seq) * opt->nb_flows,
diff --git a/app/test-eventdev/test_order_common.h b/app/test-eventdev/test_order_common.h
index e0fe9c968a..90eac96fc8 100644
--- a/app/test-eventdev/test_order_common.h
+++ b/app/test-eventdev/test_order_common.h
@@ -13,6 +13,7 @@
 #include <rte_lcore.h>
 #include <rte_malloc.h>
 #include <rte_mbuf.h>
+#include <rte_mbuf_dyn.h>
 
 #include "evt_common.h"
 #include "evt_options.h"
@@ -20,6 +21,8 @@
 
 #define BURST_SIZE 16
 
+typedef uint32_t flow_id_t;
+
 struct test_order;
 
 struct worker_data {
@@ -49,6 +52,7 @@ struct test_order {
 	uint32_t nb_flows;
 	uint64_t nb_pkts;
 	struct rte_mempool *pool;
+	int flow_id_dynfield_offset;
 	struct prod_data prod;
 	struct worker_data worker[EVT_MAX_PORTS];
 	uint32_t *producer_flow_seq;
@@ -56,6 +60,23 @@ struct test_order {
 	struct evt_options *opt;
 } __rte_cache_aligned;
 
+static inline void
+order_flow_id_copy_from_mbuf(struct test_order *t, struct rte_event *event)
+{
+	event->flow_id = *RTE_MBUF_DYNFIELD(event->mbuf,
+			t->flow_id_dynfield_offset, flow_id_t *);
+}
+
+static inline void
+order_flow_id_save(struct test_order *t, flow_id_t flow_id,
+		struct rte_mbuf *mbuf, struct rte_event *event)
+{
+	*RTE_MBUF_DYNFIELD(mbuf,
+			t->flow_id_dynfield_offset, flow_id_t *) = flow_id;
+	event->flow_id = flow_id;
+	event->mbuf = mbuf;
+}
+
 static inline int
 order_nb_event_ports(struct evt_options *opt)
 {
diff --git a/app/test-eventdev/test_order_queue.c b/app/test-eventdev/test_order_queue.c
index 1511c0092d..621367805a 100644
--- a/app/test-eventdev/test_order_queue.c
+++ b/app/test-eventdev/test_order_queue.c
@@ -35,7 +35,7 @@ order_queue_worker(void *arg, const bool flow_id_cap)
 		}
 
 		if (!flow_id_cap)
-			ev.flow_id = ev.mbuf->udata64;
+			order_flow_id_copy_from_mbuf(t, &ev);
 
 		if (ev.queue_id == 0) { /* from ordered queue */
 			order_queue_process_stage_0(&ev);
@@ -73,7 +73,7 @@ order_queue_worker_burst(void *arg, const bool flow_id_cap)
 		for (i = 0; i < nb_rx; i++) {
 
 			if (!flow_id_cap)
-				ev[i].flow_id = ev[i].mbuf->udata64;
+				order_flow_id_copy_from_mbuf(t, &ev[i]);
 
 			if (ev[i].queue_id == 0) { /* from ordered queue */
 				order_queue_process_stage_0(&ev[i]);
