diff --git a/modules/luci-base/htdocs/luci-static/resources/cbi.js b/modules/luci-base/htdocs/luci-static/resources/cbi.js
index 513256e4c9..b8446ec52f 100644
--- a/modules/luci-base/htdocs/luci-static/resources/cbi.js
+++ b/modules/luci-base/htdocs/luci-static/resources/cbi.js
@@ -646,7 +646,11 @@ String.prototype.format = function()
 						for (i = 0; (i < units.length) && (val > mf); i++)
 							val /= mf;
 
-						subst = (i ? val.toFixed(pr) : val) + units[i];
+						if (i)
+							subst = val.toFixed(pr) + units[i] + (mf == 1024 ? 'i' : '');
+						else
+							subst = val + ' ';
+
 						pMinLength = null;
 						break;
 				}