diff --git a/app/views/admin/announcements/_form.html.erb b/app/views/admin/announcements/_form.html.erb
index 431f2a3..fb4fd59 100644
--- a/app/views/admin/announcements/_form.html.erb
+++ b/app/views/admin/announcements/_form.html.erb
@@ -918,6 +918,14 @@
       $("#sub_annc_title_trans_text").html($(this).val());
     })
     $("#bulletin_is_external_link").trigger('change');
+    $('#<%=f.object_name.gsub(/[\[\]]/,'_')%>_external_link').on('paste', function(e){
+      var pastedData = e.originalEvent.clipboardData.getData('text');
+      var _this = $(this);
+      pastedData = pastedData.replace(new RegExp('^http(s|)://' + window.location.host), '');
+      window.setTimeout(function(){
+        _this.val(pastedData);
+      }, 0);
+    });
     add_click_for_privacy()
   });
 </script>