diff --git a/lib/thumbnailview/thumbnailview.h b/lib/thumbnailview/thumbnailview.h
--- a/lib/thumbnailview/thumbnailview.h
+++ b/lib/thumbnailview/thumbnailview.h
@@ -48,7 +48,7 @@
 public:
     enum {
         MinThumbnailSize = 48,
-        MaxThumbnailSize = 256
+        MaxThumbnailSize = 512
     };
 
     enum ThumbnailScaleMode {