diff --git a/tinyfilemanager.php b/tinyfilemanager.php
index 85acb48..07740fc 100644
--- a/tinyfilemanager.php
+++ b/tinyfilemanager.php
@@ -2244,9 +2244,17 @@ function fm_get_size($file)
  */
 function fm_get_filesize($size)
 {
-    $units = array('B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB');
-    $power = $size > 0 ? floor(log($size, 1024)) : 0;
-    return sprintf('%s %s', round($size / pow(1024, $power), 2), $units[$power]);
+    if ($size < 1000) {
+        return sprintf('%s B', $size);
+    } elseif (($size / 1024) < 1000) {
+        return sprintf('%s KB', round(($size / 1024), 2));
+    } elseif (($size / 1024 / 1024) < 1000) {
+        return sprintf('%s MB', round(($size / 1024 / 1024), 2));
+    } elseif (($size / 1024 / 1024 / 1024) < 1000) {
+        return sprintf('%s GB', round(($size / 1024 / 1024 / 1024), 2));
+    } else {
+        return sprintf('%s TB', round(($size / 1024 / 1024 / 1024 / 1024), 2));
+    }
 }
 
 /**