Index: wp-content/themes/twentythirteen/style.css
===================================================================
--- wp-content/themes/twentythirteen/style.css	(revision 23689)
+++ wp-content/themes/twentythirteen/style.css	(working copy)
@@ -3070,6 +3070,7 @@
 	.search .format-gallery .gallery-item {
 		margin-bottom: 2%;
 		margin-right: 2%;
+		max-width: none;
 		width: 49%;
 	}