diff --git a/usr/local/www/graph.php b/usr/local/www/graph.php
index d79a877af8..f0230e63ae 100755
--- a/usr/local/www/graph.php
+++ b/usr/local/www/graph.php
@@ -196,19 +196,9 @@ function plot_data(obj) {
     return handle_error();
 
   var diff_ugmt  = ugmt - last_ugmt;
-  if (last_ifin < ifin) {
-    var diff_ifin  = ifin - last_ifin;
-  } else {
-    real_last_ifin = (4294967296 - last_ifin)
-    var diff_ifin  = ifin + real_last_ifin;
-  }
-  if (last_ifout < ifout) {
-    var diff_ifout  = ifout - last_ifout;
-  } else {
-    real_last_ifout = (4294967296 - last_ifout)
-    var diff_ifout  = ifout + real_last_ifout;
-  }
-  
+  var diff_ifin  = ifin - last_ifin;
+  var diff_ifout = ifout - last_ifout;
+
   if (diff_ugmt == 0)
     diff_ugmt = 1;  /* avoid division by zero */