diff --git a/classes/element.php b/classes/element.php
index 9c55060..0a9ebfa 100644
--- a/classes/element.php
+++ b/classes/element.php
@@ -129,7 +129,7 @@ abstract class element {
         $element->name = $data->name;
         $element->data = $this->save_unique_data($data);
         $element->font = (isset($data->font)) ? $data->font : null;
-        $element->size = (isset($data->size)) ? $data->size : null;
+        $element->fontsize = (isset($data->fontsize)) ? $data->fontsize : null;
         $element->colour = (isset($data->colour)) ? $data->colour : null;
         if ($this->showposxy) {
             $element->posx = (isset($data->posx)) ? $data->posx : null;
diff --git a/classes/element_helper.php b/classes/element_helper.php
index 39cfe6d..d12b84c 100644
--- a/classes/element_helper.php
+++ b/classes/element_helper.php
@@ -61,7 +61,7 @@ class element_helper {
      */
     public static function render_content($pdf, $element, $content) {
         list($font, $attr) = self::get_font($element);
-        $pdf->setFont($font, $attr, $element->size);
+        $pdf->setFont($font, $attr, $element->fontsize);
         $fontcolour = \TCPDF_COLORS::convertHTMLColorToDec($element->colour, $fontcolour);
         $pdf->SetTextColor($fontcolour['R'], $fontcolour['G'], $fontcolour['B']);
 
@@ -120,7 +120,7 @@ class element_helper {
             $fontstyle .= '; font-style: italic';
         }
 
-        $style = $fontstyle . '; color: ' . $element->colour . '; font-size: ' . $element->size . 'pt;';
+        $style = $fontstyle . '; color: ' . $element->colour . '; font-size: ' . $element->fontsize . 'pt;';
         if ($element->width) {
             $style .= ' width: ' . $element->width . 'mm';
         }
@@ -137,10 +137,10 @@ class element_helper {
         $mform->setType('font', PARAM_TEXT);
         $mform->setDefault('font', 'times');
         $mform->addHelpButton('font', 'font', 'customcert');
-        $mform->addElement('select', 'size', get_string('fontsize', 'customcert'), \mod_customcert\certificate::get_font_sizes());
-        $mform->setType('size', PARAM_INT);
-        $mform->setDefault('size', 12);
-        $mform->addHelpButton('size', 'fontsize', 'customcert');
+        $mform->addElement('select', 'fontsize', get_string('fontsize', 'customcert'), \mod_customcert\certificate::get_font_sizes());
+        $mform->setType('fontsize', PARAM_INT);
+        $mform->setDefault('fontsize', 12);
+        $mform->addHelpButton('fontsize', 'fontsize', 'customcert');
     }
 
     /**
diff --git a/db/install.xml b/db/install.xml
index 44902c6..1fbf109 100644
--- a/db/install.xml
+++ b/db/install.xml
@@ -78,7 +78,7 @@
         <FIELD NAME="element" TYPE="text" LENGTH="big" NOTNULL="true" SEQUENCE="false"/>
         <FIELD NAME="data" TYPE="text" LENGTH="big" NOTNULL="false" SEQUENCE="false"/>
         <FIELD NAME="font" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false"/>
-        <FIELD NAME="size" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false"/>
+        <FIELD NAME="fontsize" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false"/>
         <FIELD NAME="colour" TYPE="char" LENGTH="50" NOTNULL="false" SEQUENCE="false"/>
         <FIELD NAME="posx" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false"/>
         <FIELD NAME="posy" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false"/>
diff --git a/db/upgrade.php b/db/upgrade.php
index b085173..a666e93 100644
--- a/db/upgrade.php
+++ b/db/upgrade.php
@@ -121,5 +121,19 @@ function xmldb_customcert_upgrade($oldversion) {
         upgrade_mod_savepoint(true, 2017050502, 'customcert');
     }
 
+    if ($oldversion < 2017050506) {
+        $table = new xmldb_table('customcert_elements');
+        $field = new xmldb_field('size');
+
+        // Rename column as it is a reserved word in Oracle.
+        if ($dbman->field_exists($table, $field)) {
+            $field->set_attributes(XMLDB_TYPE_INTEGER, '10', null, null, null, null, 'font');
+            $dbman->rename_field($table, $field, 'fontsize');
+        }
+
+        // Savepoint reached.
+        upgrade_mod_savepoint(true, 2017050506, 'customcert');
+    }
+
     return true;
 }
diff --git a/version.php b/version.php
index 322806f..579c831 100644
--- a/version.php
+++ b/version.php
@@ -24,10 +24,10 @@
 
 defined('MOODLE_INTERNAL') || die('Direct access to this script is forbidden.');
 
-$plugin->version   = 2017050505; // The current module version (Date: YYYYMMDDXX).
+$plugin->version   = 2017050506; // The current module version (Date: YYYYMMDDXX).
 $plugin->requires  = 2017050500; // Requires this Moodle version (3.3).
 $plugin->cron      = 0; // Period for cron to check this module (secs).
 $plugin->component = 'mod_customcert';
 
 $plugin->maturity  = MATURITY_STABLE;
-$plugin->release   = "3.3 release (Build: 2017050505)"; // User-friendly version number.
+$plugin->release   = "3.3 release (Build: 2017050506)"; // User-friendly version number.