--- url.sty~	2016-03-14 22:55:33.787125639 +0100
+++ url.sty	2016-03-14 22:58:44.780050010 +0100
@@ -154,7 +154,7 @@
     \lccode`\~`#1\lowercase{\endgroup\def~}{#2}}
 \def\set@mathnolig#1{\ifnum\mathcode`#1<32768
    \begingroup\lccode`\~`#1\lowercase{\endgroup
-     \edef~}{\mathchar\number\mathcode`#1\sb{\/}}%
+     \edef~}{\mathchar\number\mathcode`#1_{\/}}%
    \mathcode`#1=32768 \fi}
 
 \def\Url@movingtest{\begingroup