diff --git a/phpBB/includes/functions_profile_fields.php b/phpBB/includes/functions_profile_fields.php
index 10af997bff..63b0eab3e1 100644
--- a/phpBB/includes/functions_profile_fields.php
+++ b/phpBB/includes/functions_profile_fields.php
@@ -1040,9 +1040,9 @@ class custom_profile_admin extends custom_profile
 		global $user;
 
 		$options = array(
-			0 => array('TITLE' => $user->lang['FIELD_LENGTH'],		'FIELD' => '<input type="text" name="field_length" size="5" value="' . $this->vars['field_length'] . '" />'),
-			1 => array('TITLE' => $user->lang['MIN_FIELD_CHARS'],	'FIELD' => '<input type="text" name="field_minlen" size="5" value="' . $this->vars['field_minlen'] . '" />'),
-			2 => array('TITLE' => $user->lang['MAX_FIELD_CHARS'],	'FIELD' => '<input type="text" name="field_maxlen" size="5" value="' . $this->vars['field_maxlen'] . '" />'),
+			0 => array('TITLE' => $user->lang['FIELD_LENGTH'],		'FIELD' => '<input type="number" min="0" max="99999" name="field_length" size="5" value="' . $this->vars['field_length'] . '" />'),
+			1 => array('TITLE' => $user->lang['MIN_FIELD_CHARS'],	'FIELD' => '<input type="number" min="0" max="99999" name="field_minlen" size="5" value="' . $this->vars['field_minlen'] . '" />'),
+			2 => array('TITLE' => $user->lang['MAX_FIELD_CHARS'],	'FIELD' => '<input type="number" min="0" max="99999" size="5" value="' . $this->vars['field_maxlen'] . '" />'),
 			3 => array('TITLE' => $user->lang['FIELD_VALIDATION'],	'FIELD' => '<select name="field_validation">' . $this->validate_options() . '</select>')
 		);
 
@@ -1057,9 +1057,9 @@ class custom_profile_admin extends custom_profile
 		global $user;
 
 		$options = array(
-			0 => array('TITLE' => $user->lang['FIELD_LENGTH'],		'FIELD' => '<input name="rows" size="5" value="' . $this->vars['rows'] . '" /> ' . $user->lang['ROWS'] . '</dd><dd><input name="columns" size="5" value="' . $this->vars['columns'] . '" /> ' . $user->lang['COLUMNS'] . ' <input type="hidden" name="field_length" value="' . $this->vars['field_length'] . '" />'),
-			1 => array('TITLE' => $user->lang['MIN_FIELD_CHARS'],	'FIELD' => '<input type="text" name="field_minlen" size="10" value="' . $this->vars['field_minlen'] . '" />'),
-			2 => array('TITLE' => $user->lang['MAX_FIELD_CHARS'],	'FIELD' => '<input type="text" name="field_maxlen" size="10" value="' . $this->vars['field_maxlen'] . '" />'),
+			0 => array('TITLE' => $user->lang['FIELD_LENGTH'],		'FIELD' => '<input type="number" min="0" max="99999" name="rows" size="5" value="' . $this->vars['rows'] . '" /> ' . $user->lang['ROWS'] . '</dd><dd><input type="number" min="0" max="99999" name="columns" size="5" value="' . $this->vars['columns'] . '" /> ' . $user->lang['COLUMNS'] . ' <input type="hidden" name="field_length" value="' . $this->vars['field_length'] . '" />'),
+			1 => array('TITLE' => $user->lang['MIN_FIELD_CHARS'],	'FIELD' => '<input type="number" min="0" max="9999999999" name="field_minlen" size="10" value="' . $this->vars['field_minlen'] . '" />'),
+			2 => array('TITLE' => $user->lang['MAX_FIELD_CHARS'],	'FIELD' => '<input type="number" min="0" max="9999999999" name="field_maxlen" size="10" value="' . $this->vars['field_maxlen'] . '" />'),
 			3 => array('TITLE' => $user->lang['FIELD_VALIDATION'],	'FIELD' => '<select name="field_validation">' . $this->validate_options() . '</select>')
 		);
 
@@ -1074,9 +1074,9 @@ class custom_profile_admin extends custom_profile
 		global $user;
 
 		$options = array(
-			0 => array('TITLE' => $user->lang['FIELD_LENGTH'],		'FIELD' => '<input type="text" name="field_length" size="5" value="' . $this->vars['field_length'] . '" />'),
-			1 => array('TITLE' => $user->lang['MIN_FIELD_NUMBER'],	'FIELD' => '<input type="text" name="field_minlen" size="5" value="' . $this->vars['field_minlen'] . '" />'),
-			2 => array('TITLE' => $user->lang['MAX_FIELD_NUMBER'],	'FIELD' => '<input type="text" name="field_maxlen" size="5" value="' . $this->vars['field_maxlen'] . '" />'),
+			0 => array('TITLE' => $user->lang['FIELD_LENGTH'],		'FIELD' => '<input type="number" min="0" max="99999" name="field_length" size="5" value="' . $this->vars['field_length'] . '" />'),
+			1 => array('TITLE' => $user->lang['MIN_FIELD_NUMBER'],	'FIELD' => '<input type="number" min="0" max="99999" name="field_minlen" size="5" value="' . $this->vars['field_minlen'] . '" />'),
+			2 => array('TITLE' => $user->lang['MAX_FIELD_NUMBER'],	'FIELD' => '<input type="number" min="0" max="99999" name="field_maxlen" size="5" value="' . $this->vars['field_maxlen'] . '" />'),
 			3 => array('TITLE' => $user->lang['DEFAULT_VALUE'],		'FIELD' => '<input type="post" name="field_default_value" value="' . $this->vars['field_default_value'] . '" />')
 		);