diff -Naur urlgrabber-3.9.1-orig/urlgrabber/grabber.py urlgrabber-3.9.1/urlgrabber/grabber.py
--- urlgrabber-3.9.1-orig/urlgrabber/grabber.py	2011-10-13 09:31:41.649886173 -0600
+++ urlgrabber-3.9.1/urlgrabber/grabber.py	2011-10-13 09:51:25.543291422 -0600
@@ -1532,11 +1532,13 @@
     def _over_max_size(self, cur, max_size=None):
 
         if not max_size:
-            max_size = self.size
-        if self.opts.size: # if we set an opts size use that, no matter what
-            max_size = self.opts.size
+            if not self.opts.size:
+                max_size = self.size
+            else:
+                max_size = self.opts.size
+
         if not max_size: return False # if we have None for all of the Max then this is dumb
-        if cur > max_size + max_size*.10:
+        if cur > int(float(max_size) * 1.10):
 
             msg = _("Downloaded more than max size for %s: %s > %s") \
                         % (self.url, cur, max_size)