diff --git a/modules/markup/html.go b/modules/markup/html.go
index 7afd8114c1b32..9ef61f99a44c0 100644
--- a/modules/markup/html.go
+++ b/modules/markup/html.go
@@ -375,7 +375,7 @@ func visitNode(ctx *RenderContext, procs []processor, node *html.Node, visitText
 					}
 					prefix = strings.Replace(prefix, "/src/", "/media/", 1)
 
-					attr.Val = util.URLJoin(prefix, attr.Val)
+					node.Attr[idx].Val = util.URLJoin(prefix, attr.Val)
 				}
 				node.Attr[i] = attr
 			}
@@ -392,7 +392,7 @@ func visitNode(ctx *RenderContext, procs []processor, node *html.Node, visitText
 				for i, class := range classes {
 					if class == "icon" {
 						classes[0], classes[i] = classes[i], classes[0]
-						attr.Val = strings.Join(classes, " ")
+						node.Attr[idx].Val = strings.Join(classes, " ")
 
 						// Remove all children of icons
 						child := node.FirstChild