1 files changed, 2 insertions, 0 deletions
diff --git a/test/testbmk.c b/test/testbmk.c
index 54da81fd8..4958ddf8b 100644
--- a/test/testbmk.c
+++ b/test/testbmk.c
@@ -465,10 +465,12 @@ static void bmk9_execute(void) {
   test_wait_tick();
   test_start_timer(1000);
   do {
+    chSysLock();
     chIQPutI(&iq, 0);
     chIQPutI(&iq, 1);
     chIQPutI(&iq, 2);
     chIQPutI(&iq, 3);
+    chSysUnlock();
     (void)chIQGet(&iq);
     (void)chIQGet(&iq);
     (void)chIQGet(&iq);