diff --git a/fb_canvas.admin.inc b/fb_canvas.admin.inc
index 2328a42..4010d5e 100644
--- a/fb_canvas.admin.inc
+++ b/fb_canvas.admin.inc
@@ -27,7 +27,7 @@ function fb_canvas_fb_admin($op, $data, &$return) {
     }
     if (variable_get(FB_VAR_SECURE_URLS, FB_SECURE_URLS_SOMETIMES) <= FB_SECURE_URLS_SOMETIMES) {
       // Make callback_url HTTP, even if we administer drupal via HTTPS.
-      $return['callback_url'] = str_replace('https://', 'http:', $return['callback_url']);
+      $return['callback_url'] = str_replace('https://', 'http://', $return['callback_url']);
     }
   }
   elseif ($op == FB_ADMIN_OP_LIST_PROPERTIES) {