diff --git a/src/front-matter.js b/src/front-matter.js
index e256a5e..2a22c6b 100644
--- a/src/front-matter.js
+++ b/src/front-matter.js
@@ -96,6 +96,7 @@ export function mergeFromYMLFrontmatter(target, source) {
   target.authors = source.authors.map( (authorObject) => new Author(authorObject));
   target.katex = source.katex;
   target.password = source.password;
+  target.doi = source.doi;
 }
 
 export class FrontMatter {