diff --git a/includes/common.inc b/includes/common.inc
index 3cd1a3feb785a77ec10b42cfab2dafb3c039b292..957680056ecb99516187c636e9b23d4809f472b8 100644
--- a/includes/common.inc
+++ b/includes/common.inc
@@ -618,6 +618,8 @@ function _t(&$value, $key) {
     default:
       $value = theme('placeholder', $value);
       return;
+    // Pass-through
+    case '!':
   }
 }