Index: wp-content/themes/twentythirteen/css/ie.css
===================================================================
--- wp-content/themes/twentythirteen/css/ie.css	(revision 23961)
+++ wp-content/themes/twentythirteen/css/ie.css	(working copy)
@@ -1,9 +1,11 @@
 /*
 Styles for older IE versions (previous to IE9).
 */
+
 .site {
 	min-width: 1040px;
 }
+
 .genericon:before:hover,
 .menu-toggle:after:hover,
 .date a:before:hover,
@@ -61,11 +63,14 @@
 	margin: 0;
 }
 
-.gallery-item,
-.gallery img {
+.gallery .gallery-item {
 	max-width: none;
 }
 
+.gallery img {
+	width: auto;
+}
+
 .gallery-caption {
 	background: #000;
 	filter: alpha(opacity=0);