diff --git a/tests/lib/onoff/src/main.c b/tests/lib/onoff/src/main.c
index 1b3f66b391d..20f22a3fbf8 100644
--- a/tests/lib/onoff/src/main.c
+++ b/tests/lib/onoff/src/main.c
@@ -1055,7 +1055,7 @@ static void test_cancel_or_release(void)
 static void test_sync_basic(void)
 {
 	struct onoff_sync_service srv = {};
-	struct k_spinlock_key key;
+	k_spinlock_key_t key;
 	int res = 5;
 	int rc;
 
@@ -1132,7 +1132,7 @@ static void test_sync_basic(void)
 static void test_sync_error(void)
 {
 	struct onoff_sync_service srv = {};
-	struct k_spinlock_key key;
+	k_spinlock_key_t key;
 	int res = -EPERM;
 	int rc;