diff --git a/src/Utility/SearchAPIHelper.php b/src/Utility/SearchAPIHelper.php
index 848a325..bffe107 100644
--- a/src/Utility/SearchAPIHelper.php
+++ b/src/Utility/SearchAPIHelper.php
@@ -35,6 +35,9 @@ public static function checkMultivalue($field) {
         $multivalue = TRUE;
       }
     }
+    elseif ($field->getDataDefinition()->isList()) {
+      $multivalue = TRUE;
+    }
 
     return $multivalue;
   }