diff --git a/admin/students_info.php b/admin/students_info.php
index 9bc1389b..b95170b4 100644
--- a/admin/students_info.php
+++ b/admin/students_info.php
@@ -52,7 +52,7 @@
 	echo "</tr>\n";
 	echo "<tr>\n";
 	echo " <th>".i18n("Grade")."</th><td>$studentinfo->grade</td>\n";
-	echo " <th>".i18n("Sex")."</th><td>$studentinfo->sex</td>\n";
+	echo " <th>".i18n("Gender")."</th><td>$studentinfo->sex</td>\n";
 	echo "</tr>\n";
 	echo "<tr>\n";
 	echo " <th>".i18n("Email Address")."</th><td>$studentinfo->email</td>\n";
diff --git a/db/db.code.version.txt b/db/db.code.version.txt
index 2bd5a0a9..40994076 100644
--- a/db/db.code.version.txt
+++ b/db/db.code.version.txt
@@ -1 +1 @@
-22
+23
diff --git a/db/db.update.23.sql b/db/db.update.23.sql
new file mode 100644
index 00000000..fcf062eb
--- /dev/null
+++ b/db/db.update.23.sql
@@ -0,0 +1 @@
+ALTER TABLE `students` CHANGE `sex` `sex` ENUM( 'male', 'female' ) NULL DEFAULT NULL;
diff --git a/register_participants_students.php b/register_participants_students.php
index e44eb71e..c918c351 100644
--- a/register_participants_students.php
+++ b/register_participants_students.php
@@ -267,7 +267,7 @@ else if($newstatus=="complete")
 if($config['participant_student_personal']=="yes")
 {
 	echo "<tr>\n";
-	echo " <td>".i18n("Sex")."</td><td>";
+	echo " <td>".i18n("Gender")."</td><td>";
 	echo "<select name=\"sex[$x]\">";
 	echo "<option value=\"\">".i18n("Select")."</option>\n";
 	if($studentinfo->sex=="male") $sel="selected=\"selected\""; else $sel="";