diff --git a/less/forum/Post.less b/less/forum/Post.less
index bc7739b82..98986c901 100644
--- a/less/forum/Post.less
+++ b/less/forum/Post.less
@@ -348,7 +348,7 @@
     min-height: 64px + 40px; // avatar height + padding
   }
   .PostUser-avatar {
-    margin-left: -@avatar-column-width;
+    left: -@avatar-column-width;
     position: absolute;
     .Avatar--size(64px);
   }