1 files changed, 1 insertions, 1 deletions
diff --git a/app/Census/CensusColumnBirthDate.php b/app/Census/CensusColumnBirthDate.php
index c5cf1e7b13..aa89a535ce 100644
--- a/app/Census/CensusColumnBirthDate.php
+++ b/app/Census/CensusColumnBirthDate.php
@@ -31,7 +31,7 @@ class CensusColumnBirthDate extends AbstractCensusColumn implements CensusColumn
      *
      * @return string
      */
-    public function generate(Individual $individual, Individual $head = null)
+    public function generate(Individual $individual, Individual $head)
     {
         return $individual->getEstimatedBirthDate()->minimumDate()->format('%j %n %Y');
     }