diff --git a/Tests/convertTest.php b/Tests/convertTest.php
index b4bd8c9..ed276bc 100644
--- a/Tests/convertTest.php
+++ b/Tests/convertTest.php
@@ -105,6 +105,13 @@ class test_convert extends PHPUnit_Framework_TestCase
     $this->assertSame ($res, "-12.35kB");
   }
 
+  public function test_humanSize_8 ()
+  {
+    $res = \convert::humanSize (0, 2);
+    $this->assertSame ($res, "0.00B");
+  }
+
+
   public function test_humanSize_error1 ()
   {
     $this->expectException ("Exception",
diff --git a/convert.php b/convert.php
index 29f78a3..31751c0 100644
--- a/convert.php
+++ b/convert.php
@@ -131,12 +131,17 @@ class convert
        6 => 'E', // exa
        7 => 'Z', // zetta
        8 => 'Y');// yotta
-    for ($factor = 8 ; $factor >= -8 ; $factor--)
+    for ($factor = 8 ; $factor > -8 ; $factor--)
     {
       if (abs ($value) >= pow ($power, $factor))
         break;
     }
-    if ($factor > 0)
+    if ($value == 0)
+    {
+      $display = 0;
+      $factor = 0;
+    }
+    elseif ($factor > 0)
       $display = $value / pow ($power, $factor);
     elseif ($factor < 0)
       $display = $value * pow ($power, -1 * $factor);