diff --git a/csl/chicago-author-date.csl b/csl/chicago-author-date.csl
index fd5abbc3a3..dc344e77f4 100644
--- a/csl/chicago-author-date.csl
+++ b/csl/chicago-author-date.csl
@@ -137,6 +137,7 @@
       <text macro="archive"/>
 	    </else-if>
 	  </choose>
+      <text variable="DOI" prefix="doi:"/>
       <text variable="URL"/>
     </group>
   </macro>
diff --git a/csl/chicago-fullnote-bibliography.csl b/csl/chicago-fullnote-bibliography.csl
index 9c0562d9a1..01a28a8aa7 100644
--- a/csl/chicago-fullnote-bibliography.csl
+++ b/csl/chicago-fullnote-bibliography.csl
@@ -568,6 +568,7 @@
       <text macro="archive-note"/>
 	    </else-if>
 	  </choose>
+      <text variable="DOI" prefix="doi:"/>
       <text variable="URL"/>
     </group>
   </macro>
diff --git a/csl/chicago-note-bibliography.csl b/csl/chicago-note-bibliography.csl
index 760b0f5454..72d4a6893a 100644
--- a/csl/chicago-note-bibliography.csl
+++ b/csl/chicago-note-bibliography.csl
@@ -369,6 +369,7 @@
       <text macro="archive"/>
 	    </else-if>
 	  </choose>
+      <text variable="DOI" prefix="doi:"/>
       <text variable="URL"/>
     </group>
   </macro>
diff --git a/csl/chicago-note-no-ibid.csl b/csl/chicago-note-no-ibid.csl
index b4bb6cc60f..c9be85c395 100644
--- a/csl/chicago-note-no-ibid.csl
+++ b/csl/chicago-note-no-ibid.csl
@@ -332,6 +332,7 @@
       <text macro="archive-note"/>
 	    </else-if>
 	  </choose>
+      <text variable="DOI" prefix="doi:"/>
       <text variable="URL"/>
     </group>
   </macro>
diff --git a/csl/chicago-note.csl b/csl/chicago-note.csl
index ef3887de92..f668796639 100644
--- a/csl/chicago-note.csl
+++ b/csl/chicago-note.csl
@@ -332,6 +332,7 @@
       <text macro="archive-note"/>
 	    </else-if>
 	  </choose>
+      <text variable="DOI" prefix="doi:"/>
       <text variable="URL"/>
     </group>
   </macro>