diff --git a/grade/report/grader/styles.php b/grade/report/grader/styles.php
index <HASH>..<HASH> 100644
--- a/grade/report/grader/styles.php
+++ b/grade/report/grader/styles.php
@@ -4,6 +4,7 @@
 
 .gradestable th.user img {
     width: 20px;
+    height: 20px;
 }
 
 .gradestable th.user, .gradestable th.range {
MDL-<I>
Specify both width and height for user image

Merged from STABLE_<I>