diff --git a/models/PhotoMosaic.php b/models/PhotoMosaic.php
index 605bdb01..db86be70 100644
--- a/models/PhotoMosaic.php
+++ b/models/PhotoMosaic.php
@@ -79,7 +79,7 @@ class PhotoMosaic
 			return -$priority_diff;
 
 		// In other cases, we'll just show the newest first.
-		return $a->getDateCaptured() > $b->getDateCaptured() ? -1 : 1;
+		return $a->getDateCaptured() <=> $b->getDateCaptured();
 	}
 
 	private static function daysApart(Image $a, Image $b)