diff --git a/kernel/include/kernel_structs.h b/kernel/include/kernel_structs.h
index 31da33f914b..f0f55cdb7e2 100644
--- a/kernel/include/kernel_structs.h
+++ b/kernel/include/kernel_structs.h
@@ -103,11 +103,11 @@ struct _thread_base {
 	union {
 		struct {
 #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
-			uint8_t sched_locked;
-			volatile int8_t prio;
+			volatile uint8_t sched_locked;
+			int8_t prio;
 #else /* LITTLE and PDP */
-			volatile int8_t prio;
-			uint8_t sched_locked;
+			int8_t prio;
+			volatile uint8_t sched_locked;
 #endif
 		};
 		uint16_t preempt;