diff --git a/install/lib/mysql.lib.php b/install/lib/mysql.lib.php
index 7cf06ee044a24aa279bed471210b5224fad490f6..e3c12a6d3bb5d39c8a8a1d45334049615f56a328 100644
--- a/install/lib/mysql.lib.php
+++ b/install/lib/mysql.lib.php
@@ -27,7 +27,7 @@
  EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-class db extends mysqli
+class db
 {
 	/**#@+
      * @access private
diff --git a/interface/lib/classes/db_mysql.inc.php b/interface/lib/classes/db_mysql.inc.php
index cd1f330487f2facde5051d34e395a76d176c70a8..e0c003abca71a5d7117dcf360ffd95801b2e289d 100644
--- a/interface/lib/classes/db_mysql.inc.php
+++ b/interface/lib/classes/db_mysql.inc.php
@@ -27,8 +27,7 @@
  EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-class db extends mysqli
-{
+class db {
 	/**#@+
      * @access private
      */
diff --git a/server/lib/classes/db_mysql.inc.php b/server/lib/classes/db_mysql.inc.php
index 0492d0747132b47be78571c9f4a9ce7f1c17e769..9b34dc4c1f3f4d3953fcd42ea8db9ec028dbee14 100644
--- a/server/lib/classes/db_mysql.inc.php
+++ b/server/lib/classes/db_mysql.inc.php
@@ -27,7 +27,7 @@
  EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-class db extends mysqli
+class db
 {
 	/**#@+
      * @access private