diff --git a/system/database/drivers/ibase/ibase_driver.php b/system/database/drivers/ibase/ibase_driver.php
index cbc1022..c1055c1 100644
--- a/system/database/drivers/ibase/ibase_driver.php
+++ b/system/database/drivers/ibase/ibase_driver.php
@@ -126,7 +126,7 @@
 	 */
 	protected function _execute($sql)
 	{
-		return ibase_query($this->conn_id, $sql);
+		return ibase_query(isset($this->_ibase_trans) ? $this->_ibase_trans : $this->conn_id, $sql);
 	}
 
 	// --------------------------------------------------------------------
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index 45e891e..d963b57 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -37,6 +37,7 @@
 -  Fixed a bug (#4449) - :doc:`Query Builder <database/query_builder>` method ``join()`` breaks conditions containing ``IS NULL``, ``IS NOT NULL``.
 -  Fixed a bug (#4491) - :doc:`Session Library <libraries/sessions>` didn't clean-up internal variables for emulated locks with the 'redis' driver.
 -  Fixed a bug where :doc:`Session Library <libraries/sessions>` didn't clean-up internal variables for emulated locks with the 'memcached' driver.
+-  Fixed a bug where :doc:`Database <database/index>` transactions didn't work with the 'ibase' driver.
 
 Version 3.0.4
 =============