diff --git a/lib/graphlib.php b/lib/graphlib.php
index 8cc39b38cfd..f742f45ce75 100644
--- a/lib/graphlib.php
+++ b/lib/graphlib.php
@@ -1110,6 +1110,7 @@ function find_range($data, $min, $max, $resolution) {
     if ($max < 0) $factor = - pow(10, (floor(log10(abs($max))) + $resolution) );
     else $factor = pow(10, (floor(log10(abs($max))) - $resolution) );
   }
+  $factor = round($factor * 1000.0) / 1000.0; // To avoid some wierd rounding errors (Moodle)
 
   $max = $factor * @ceil($max / $factor);
   $min = $factor * @floor($min / $factor);