diff --git a/src/Oci8/Oci8Connection.php b/src/Oci8/Oci8Connection.php
index 1bc7a662..1f9cd32d 100644
--- a/src/Oci8/Oci8Connection.php
+++ b/src/Oci8/Oci8Connection.php
@@ -329,7 +329,9 @@ public function createStatementFromFunction($functionName, array $bindings)
      */
     protected function getDefaultQueryGrammar()
     {
-        return $this->withTablePrefix(new QueryGrammar());
+        ($grammar = new QueryGrammar)->setConnection($this);
+
+        return $this->withTablePrefix($grammar);
     }
 
     /**
@@ -384,7 +386,9 @@ protected function getConfigMaxLength()
      */
     protected function getDefaultSchemaGrammar()
     {
-        return $this->withTablePrefix(new SchemaGrammar());
+        ($grammar = new SchemaGrammar)->setConnection($this);
+
+        return $this->withTablePrefix($grammar);
     }
 
     /**