diff --git a/src/PostgREST/QueryBuilder.hs b/src/PostgREST/QueryBuilder.hs
index 54316f09e..ea082642f 100644
--- a/src/PostgREST/QueryBuilder.hs
+++ b/src/PostgREST/QueryBuilder.hs
@@ -102,7 +102,7 @@ createReadStatement selectQuery countQuery range isSingle countTotal asCsv =
   cols = intercalate ", " [
       countResultF <> " AS total_result_set",
       "pg_catalog.count(t) AS page_total",
-      "null AS header",
+      "'' AS header",
       bodyF <> " AS body"
     ]
   bodyF