diff --git a/includes/common.inc b/includes/common.inc
index d64be82..32cd069 100644
--- a/includes/common.inc
+++ b/includes/common.inc
@@ -5219,7 +5219,7 @@ function drupal_set_page_content($content = NULL) {
   $main_content_display = &drupal_static('system_main_content_added', FALSE);
 
   if (!empty($content)) {
-    $content_block = (is_array($content) ? $content : array('main' => array('#markup' => $content)));
+    $content_block = array('main' => (is_array($content) ? $content : array('#markup' => $content)));
   }
   else {
     // Indicate that the main content has been requested. We assume that