diff --git a/css/mathfield.less b/css/mathfield.less
index fde7bc46f..ca092e0c0 100644
--- a/css/mathfield.less
+++ b/css/mathfield.less
@@ -448,7 +448,7 @@ menu .ML__base {
   z-index: -1;
 }
 
-.ML__focusedPromptBox {
+.ML__focused .ML__focusedPromptBox {
   outline: highlight auto 1px;
 }