diff --git a/layouts/partials/article-preview.html b/layouts/partials/article-preview.html
index 7d1d9d7..fc7eced 100644
--- a/layouts/partials/article-preview.html
+++ b/layouts/partials/article-preview.html
@@ -5,7 +5,7 @@
 {{ $truncateSize := cond $isBig 180 90}}
 <div class="post{{ if $isBig }} big{{ end }}">
   <div class="picture">
-    {{ $image := .Resources.GetMatch (default "*" .Params.image) }}
+    {{ $image := .Resources.GetMatch (default "**.jpg" .Params.image) }}
     <a href="{{ .RelPermalink }}">
       {{ if $image }}
       {{ $resized := $image.Fill $pictureSize}}
diff --git a/layouts/partials/header.html b/layouts/partials/header.html
index 2d2fd5f..ebac301 100644
--- a/layouts/partials/header.html
+++ b/layouts/partials/header.html
@@ -3,7 +3,7 @@
 {{ $imageSizeBig := cond $isBig "1920x850 Top" "1920x450 Center" }}
 <header class="header{{ if $isBig }} home{{ end }}">
   {{ $headless := .Site.GetPage "/" }}
-  {{ $image := default ($headless.Resources.GetMatch "*") (.Resources.GetMatch (default "*" .Params.image)) }}
+  {{ $image := default ($headless.Resources.GetMatch "**.jpg") (.Resources.GetMatch (default "**.jpg" .Params.image)) }}
   {{ if $image }}
     {{ $resizedSmall := $image.Fill $imageSizeSmall }}
     {{ $resizedBig := $image.Fill $imageSizeBig }}