diff --git a/app/assets/stylesheets/common/base/lightbox.scss b/app/assets/stylesheets/common/base/lightbox.scss
index 06c32b1636c..afda8664ad4 100644
--- a/app/assets/stylesheets/common/base/lightbox.scss
+++ b/app/assets/stylesheets/common/base/lightbox.scss
@@ -10,6 +10,9 @@
 
 .lightbox-wrapper {
   display: inline-block;
+  img {
+    width: auto;
+  }
   &,
   * {
     outline: 0;