diff --git a/koha-tmpl/opac-tmpl/bootstrap/en/modules/sco/sco-main.tt b/koha-tmpl/opac-tmpl/bootstrap/en/modules/sco/sco-main.tt
index 922a0dbc4d..b1c2f1137a 100644
--- a/koha-tmpl/opac-tmpl/bootstrap/en/modules/sco/sco-main.tt
+++ b/koha-tmpl/opac-tmpl/bootstrap/en/modules/sco/sco-main.tt
@@ -16,7 +16,7 @@
 </script>
 <script type="text/javascript" src="[% interface %]/[% theme %]/lib/modernizr.min.js"></script>
 </head>
-<body onload="dofocus();">
+<body onload="dofocus();" onunload="mungeHistory();">
 [% INCLUDE 'masthead-sco.inc' %]
 
     <div class="main">
@@ -309,8 +309,17 @@
     [% INCLUDE 'datatables.inc' %]
     <script type="text/javascript">
         //<![CDATA[
+        function mungeHistory() {
+            // prevent back button from allowing form resubmission
+            if (history && history.pushState) {
+                history.replaceState(null, document.title, window.location.href);
+            }
+        }
+        var mainTimeout;
         function sco_init() {
-            setTimeout("location.href='/cgi-bin/koha/sco/sco-main.pl?op=logout';",[% SelfCheckTimeout %]);
+            mainTimeout = setTimeout(function() {
+                location.href = '/cgi-bin/koha/sco/sco-main.pl?op=logout';
+            }, [% SelfCheckTimeout %]);
         }
         function dofocus() {    // named function req'd for body onload event by some FF and IE7 security models
             // alert("dofocus called");
@@ -346,6 +355,7 @@
             }));
 
             $("#logout_form").submit(function(){
+                clearTimeout(mainTimeout);
                 if(confirm("Would you like to print a receipt?")){
                     window.open("/cgi-bin/koha/sco/printslip.pl?borrowernumber=[% borrowernumber %]&amp;print=qslip");
                 }
@@ -357,4 +367,4 @@
 
     [% IF ( opacuserjs ) %]<script type="text/javascript">[% opacuserjs %]</script>[% END %]
     [% IF ( SCOUserJS ) %]<script type="text/javascript">[% SCOUserJS %]</script>[% END %]
-[% END %]
\ No newline at end of file
+[% END %]
diff --git a/koha-tmpl/opac-tmpl/prog/en/modules/sco/sco-main.tt b/koha-tmpl/opac-tmpl/prog/en/modules/sco/sco-main.tt
index 380336899d..6ab8b11d31 100644
--- a/koha-tmpl/opac-tmpl/prog/en/modules/sco/sco-main.tt
+++ b/koha-tmpl/opac-tmpl/prog/en/modules/sco/sco-main.tt
@@ -15,8 +15,17 @@
 </script>
 [% INCLUDE 'datatables.inc' %]
 <script type="text/javascript">//<![CDATA[
+function mungeHistory() {
+    // prevent back button from allowing form resubmission
+    if (history && history.pushState) {
+        history.replaceState(null, document.title, window.location.href);
+    }
+}
+var mainTimeout;
 function sco_init() {
-    setTimeout("location.href='/cgi-bin/koha/sco/sco-main.pl?op=logout';",[% SelfCheckTimeout %]);
+    mainTimeout = setTimeout(function() {
+        location.href = '/cgi-bin/koha/sco/sco-main.pl?op=logout';
+    }, [% SelfCheckTimeout %]);
 }
 function dofocus() {    // named function req'd for body onload event by some FF and IE7 security models
     // alert("dofocus called");
@@ -80,6 +89,7 @@ $(document).ready(function() {
         ]
     }));
     $("#logout_form").submit(function(){
+        clearTimeout(mainTimeout);
         if(confirm("Would you like to print a receipt?")){
             window.open("/cgi-bin/koha/sco/printslip.pl?borrowernumber=[% borrowernumber %]&amp;print=qslip");
         }
@@ -96,7 +106,7 @@ $(document).ready(function() {
 [% IF ( SCOUserCSS ) %]<style type="text/css">[% SCOUserCSS %]</style>[% END %]
 
 </head>
-<body onload="dofocus();">
+<body onload="dofocus();" onunload="mungeHistory();">
 
 <div id="doc" class="yui-t7">