diff --git a/src/systemcmds/tests/test_dataman.c b/src/systemcmds/tests/test_dataman.c
index 9691bf6de3..f3b4afc81f 100644
--- a/src/systemcmds/tests/test_dataman.c
+++ b/src/systemcmds/tests/test_dataman.c
@@ -70,7 +70,7 @@ task_main(int argc, char *argv[])
 
 	PX4_INFO("Starting dataman test task %s", argv[1]);
 	/* try to read an invalid item */
-	int my_id = atoi(argv[1]);
+	int my_id = atoi(argv[2]);
 
 	/* try to read an invalid item */
 	if (dm_read(DM_KEY_NUM_KEYS, 0, buffer, sizeof(buffer)) >= 0) {