diff --git a/system/helpers/captcha_helper.php b/system/helpers/captcha_helper.php
index 29911dc..ea46f97 100644
--- a/system/helpers/captcha_helper.php
+++ b/system/helpers/captcha_helper.php
@@ -126,9 +126,9 @@
 		// Determine angle and position
 		// -----------------------------------
 		$length	= strlen($word);
-		$angle	= ($length >= 6) ? rand(-($length-6), ($length-6)) : 0;
-		$x_axis	= rand(6, (360/$length)-16);
-		$y_axis = ($angle >= 0) ? rand($img_height, $img_width) : rand(6, $img_height);
+		$angle	= ($length >= 6) ? mt_rand(-($length-6), ($length-6)) : 0;
+		$x_axis	= mt_rand(6, (360/$length)-16);
+		$y_axis = ($angle >= 0) ? mt_rand($img_height, $img_width) : mt_rand(6, $img_height);
 
 		// Create image
 		// PHP.net recommends imagecreatetruecolor(), but it isn't always available
@@ -183,13 +183,13 @@
 		if ($use_font === FALSE)
 		{
 			$font_size = 5;
-			$x = rand(0, $img_width / ($length / 3));
+			$x = mt_rand(0, $img_width / ($length / 3));
 			$y = 0;
 		}
 		else
 		{
 			$font_size = 16;
-			$x = rand(0, $img_width / ($length / 1.5));
+			$x = mt_rand(0, $img_width / ($length / 1.5));
 			$y = $font_size + 2;
 		}
 
@@ -197,13 +197,13 @@
 		{
 			if ($use_font === FALSE)
 			{
-				$y = rand(0 , $img_height / 2);
+				$y = mt_rand(0 , $img_height / 2);
 				imagestring($im, $font_size, $x, $y, $word[$i], $colors['text']);
 				$x += ($font_size * 2);
 			}
 			else
 			{
-				$y = rand($img_height / 2, $img_height - 3);
+				$y = mt_rand($img_height / 2, $img_height - 3);
 				imagettftext($im, $font_size, $angle, $x, $y, $colors['text'], $font_path, $word[$i]);
 				$x += $font_size;
 			}