diff --git a/data/personen/bjorn-wijers.json b/data/personen/bjorn-wijers.json
index aabfe8e..045d5de 100644
--- a/data/personen/bjorn-wijers.json
+++ b/data/personen/bjorn-wijers.json
@@ -4,7 +4,7 @@
   "email": "",
   "gender": "male",
   "nationality": "Dutch",
-  "thumbnail": "/afbeeldingen/personen/bjorn-wijers-200x200.jpg",
+  "thumbnail": "/afbeeldingen/personen/bjorn-wijers-200x200.png",
   "websites": [{
     "id": 1,
     "name": "Burobjorn",
diff --git a/data/personen/jeroen-baten.json b/data/personen/jeroen-baten.json
index 0ccb8cf..6f700d7 100644
--- a/data/personen/jeroen-baten.json
+++ b/data/personen/jeroen-baten.json
@@ -4,7 +4,7 @@
   "email": "",
   "gender": "male",
   "nationality": "Dutch",
-  "thumbnail": "/afbeeldingen/personen/jeroen-baten-200x200.jpg",
+  "thumbnail": "/afbeeldingen/personen/jeroen-baten-200x200.png",
   "websites": [{
     "id": 1,
     "name": "Persoonlijke website",