diff --git a/templates/PhotosIndex.php b/templates/PhotosIndex.php
index c21879cb..2ec9795d 100644
--- a/templates/PhotosIndex.php
+++ b/templates/PhotosIndex.php
@@ -97,6 +97,8 @@ class PhotosIndex extends SubTemplate
 		// Can we offer double-density thumbs?
 		if ($image->width() >= $width * 2 && $image->height() >= $height * 2)
 			echo ' srcset="', $image->getThumbnailUrl($width * 2, $height * 2, $crop, $fit), ' 2x"';
+		else
+			echo ' srcset="', $image->getThumbnailUrl($image->width(), $image->height(), true), ' 2x"';
 
 		echo ' alt="" title="', $image->getTitle(), '">';