diff --git a/code/SideReportView.php b/code/SideReportView.php
index e7d627b1..35dfc0ab 100644
--- a/code/SideReportView.php
+++ b/code/SideReportView.php
@@ -37,7 +37,7 @@ public function setParameters($parameters)
         $this->parameters = $parameters;
     }
 
-    public function forTemplate()
+    public function forTemplate(): string
     {
         $records = $this->report->records($this->parameters);
         $columns = $this->report->columns();