diff --git a/src/include/daos_types.h b/src/include/daos_types.h
index eaa40b54cac..6a78f1e9b96 100644
--- a/src/include/daos_types.h
+++ b/src/include/daos_types.h
@@ -150,14 +150,14 @@ typedef d_iov_t daos_key_t;
 typedef struct daos_event {
 	/** return code of non-blocking operation */
 	int			ev_error;
+	/** Abort the task(s) related with the event queue. Only used for DAOS test internally. */
+	uint32_t		ev_abort:1;
 	/** Internal use - 152 + 8 bytes pad for pthread_mutex_t size difference on __aarch64__ */
 	struct {
 		uint64_t	space[20];
 	}			ev_private;
 	/** Used for debugging */
-	uint32_t		ev_debug;
-	/** Abort the task(s) related with the event queue. */
-	uint32_t		ev_abort:1;
+	uint64_t		ev_debug;
 } daos_event_t;
 
 /** Wait for completion event forever */