diff --git a/question/format/xhtml/format.php b/question/format/xhtml/format.php
index 2ae9029c13b..62e924cbd8e 100755
--- a/question/format/xhtml/format.php
+++ b/question/format/xhtml/format.php
@@ -23,7 +23,7 @@ function writequestion( $question ) {
     // question reflects database fields for general question and specific to type
 
     // if a category switch, just ignore
-    if ($question-qtype=='category') {
+    if ($question->qtype=='category') {
         return '';
     }