diff --git a/_test/options.txt b/_test/options.txt
index 521fd22..df4351a 100644
--- a/_test/options.txt
+++ b/_test/options.txt
@@ -15,6 +15,8 @@
 ## Title6 ## {#id_6 .class6 attr6=value6}
 
 ## Title7 ## {#id_7 attr7="value \"7"}
+
+## Title8 {#id .className attrName=attrValue class="class1 class2"}
 //- - - - - - - - -//
 <h2 id="title-0">Title 0</h2>
 <h2 id="id_1" class="class-1">Title1</h2>
@@ -24,4 +26,5 @@
 <h2 id="id_5" attr5="value5">Title5</h2>
 <h2 id="id_6" class="class6" attr6="value6">Title6</h2>
 <h2 id="id_7" attr7="value &quot;7">Title7</h2>
+<h2 id="id" class="className class1 class2" attrName="attrValue">Title8</h2>
 //= = = = = = = = = = = = = = = = = = = = = = = =//
diff --git a/parser/attribute.go b/parser/attribute.go
index 53141b7..e5f0250 100644
--- a/parser/attribute.go
+++ b/parser/attribute.go
@@ -63,11 +63,9 @@ func ParseAttributes(reader text.Reader) (Attributes, bool) {
 		}
 		if bytes.Equal(attr.Name, attrNameClass) {
 			if !attrs.findUpdate(attrNameClass, func(v interface{}) interface{} {
-				var ret interface{}
-				if ret, ok = v.([][]byte); !ok {
-					ret = [][]byte{v.([]byte)}
-				}
-				return append(ret.([][]byte), attr.Value.([]byte))
+				ret := make([]byte, 0, len(v.([]byte))+1+len(attr.Value.([]byte)))
+				ret = append(ret, v.([]byte)...)
+				return append(append(ret, ' '), attr.Value.([]byte)...)
 			}) {
 				attrs = append(attrs, attr)
 			}