diff --git a/csl/jbc.csl b/csl/jbc.csl
index 05b920220..202340898 100644
--- a/csl/jbc.csl
+++ b/csl/jbc.csl
@@ -93,6 +93,9 @@
   </macro>
   <citation>
     <option name="collapse" value="citation-number"/>
+    <sort>
+      <key variable="citation-number"/>
+    </sort>
     <layout prefix="(" suffix=")" delimiter=", ">
       <text variable="citation-number" />
     </layout>