diff --git a/CRM/Activity/Import/Form/MapField.php b/CRM/Activity/Import/Form/MapField.php
index 92d9ffd39beb..3183e7055c11 100644
--- a/CRM/Activity/Import/Form/MapField.php
+++ b/CRM/Activity/Import/Form/MapField.php
@@ -97,10 +97,7 @@ public function buildQuickForm() {
         }
       }
 
-      $sel->setOptions([
-        $sel1,
-        ['' => NULL],
-      ]);
+      $sel->setOptions([$sel1]);
     }
     $js .= "</script>\n";
     $this->assign('initHideBoxes', $js);