diff --git a/app/assets/stylesheets/common.css.scss b/app/assets/stylesheets/common.css.scss
index 06e6375e4..d73d1000a 100644
--- a/app/assets/stylesheets/common.css.scss
+++ b/app/assets/stylesheets/common.css.scss
@@ -1869,6 +1869,8 @@ img.user_thumbnail {
 }
 
 img.user_thumbnail_tiny {
+  width: auto;
+  height: auto;
   max-width: 25px;
   max-height: 25px;
   border: 1px solid #ccc;