diff --git a/os/rt/src/chmtx.c b/os/rt/src/chmtx.c
index 3243f6eee..deffb397d 100644
--- a/os/rt/src/chmtx.c
+++ b/os/rt/src/chmtx.c
@@ -202,7 +202,7 @@ void chMtxLockS(mutex_t *mp) {
           (void) chSchReadyI(queue_dequeue(tp));
           break;
         default:
-          chDbgAssert(false, "unexpected state");
+          /* Nothing to do for other states.*/
           break;
         }
         break;