diff --git a/code/PostgreSQLQuery.php b/code/PostgreSQLQuery.php
index 2225918..2b35a6b 100644
--- a/code/PostgreSQLQuery.php
+++ b/code/PostgreSQLQuery.php
@@ -58,6 +58,7 @@ class PostgreSQLQuery extends Query
 
     public function getIterator()
     {
+        pg_result_seek($this->handle, 0);
         while ($data = $this->nextRecord()) {
             yield $data;
         }
diff --git a/composer.json b/composer.json
index 23675f1..b9ca9ac 100644
--- a/composer.json
+++ b/composer.json
@@ -15,6 +15,7 @@
         }
     ],
     "require": {
+        "ext-pgsql": "*",
         "silverstripe/framework": "^5",
         "silverstripe/vendor-plugin": "^1.0"
     },