diff --git a/lib/commentlib.php b/lib/commentlib.php
index fb49a9f5fa1..2b9a38db830 100644
--- a/lib/commentlib.php
+++ b/lib/commentlib.php
@@ -396,6 +396,7 @@ EOD;
                 $userpic->user = $user;
                 $userpic->courseid = $this->course->id;
                 $userpic->link = true;
+                $userpic->size = 18;
                 $userpic->alttext = true;
                 $c->avatar = $OUTPUT->user_picture($userpic);
                 if (($USER->id == $c->userid) || !empty($candelete)) {
diff --git a/theme/standard/styles_layout.css b/theme/standard/styles_layout.css
index 747b24fa1e0..1e2dab90aeb 100644
--- a/theme/standard/styles_layout.css
+++ b/theme/standard/styles_layout.css
@@ -5572,10 +5572,6 @@ wikiadminactions {
     width: 20px;
     float:left;
 }
-.comment-userpicture img.image{
-    width: 18px;
-    height: 18px;
-}
 .comment-content{
     margin-left: 22px;
 }