diff --git a/data/contact.yaml b/data/contact.yaml
index 4ae354b984205d8fe32b770514f754ef538f34cb..1b77fa5b54598c7187b54d3af73c234448654ec0 100644
--- a/data/contact.yaml
+++ b/data/contact.yaml
@@ -3,7 +3,7 @@ people: [
     name: Dr. Matthieu Schaller,
     role: Project PI,
     affil: "Lorentz Institute & Leiden Observatory",
-    href: "www.matthieuschaller.com",
+    href: "https://www.matthieuschaller.com",
     expertise: Lead-developer,
   },
   {