diff --git a/pygal/util.py b/pygal/util.py
index 3b0effd..7fd1884 100644
--- a/pygal/util.py
+++ b/pygal/util.py
@@ -38,7 +38,7 @@ def float_format(number):
 
 def humanize(number):
     """Format a number to engineer scale"""
-    order = number and int(floor(log(abs(number)) / log(1000)))
+    order = number and int(log10(abs(number)) / 3.0)
     human_readable = ORDERS.split(" ")[int(order > 0)]
     if order == 0 or order > len(human_readable):
         return float_format(number / (1000 ** int(order)))