diff --git a/webroot/rsrc/js/phuix/PHUIXAutocomplete.js b/webroot/rsrc/js/phuix/PHUIXAutocomplete.js
--- a/webroot/rsrc/js/phuix/PHUIXAutocomplete.js
+++ b/webroot/rsrc/js/phuix/PHUIXAutocomplete.js
@@ -199,7 +199,7 @@
       // to press Alt to type characters like "@" on a German keyboard layout.
       // The cost of misfiring autocompleters is very small since we do not
       // eat the keystroke. See T10252.
-      if (r.metaKey || r.ctrlKey) {
+      if (r.metaKey || (r.ctrlKey && !r.altKey)) {
         return;
       }