diff --git a/doc/joss/paper.md b/doc/joss/paper.md
index 893ec65..b1559a8 100644
--- a/doc/joss/paper.md
+++ b/doc/joss/paper.md
@@ -16,7 +16,7 @@ authors:
  affiliations:
  - name: Institut Pasteur
    index: 1
- date: 2 August 2017
+date: 2 August 2017
 bibliography: paper.bib
 ---