diff --git a/_test/options.txt b/_test/options.txt
index a90449f..99bc29c 100644
--- a/_test/options.txt
+++ b/_test/options.txt
@@ -45,3 +45,18 @@
 <h2 id="recordsself-zone-params"><code>records(self, zone, params={})</code></h2>
 //= = = = = = = = = = = = = = = = = = = = = = = =//
 
+
+4
+//- - - - - - - - -//
+## Test {#hey .sort,class=fine,class=shell} Doesn't matter
+//- - - - - - - - -//
+<h2 id="test-hey-sortclassfineclassshell-doesnt-matter">Test {#hey .sort,class=fine,class=shell} Doesn't matter</h2>
+//= = = = = = = = = = = = = = = = = = = = = = = =//
+
+
+5
+//- - - - - - - - -//
+## Test ## {#hey .sort,class=fine,class=shell} Doesn't matter
+//- - - - - - - - -//
+<h2 id="test--hey-sortclassfineclassshell-doesnt-matter">Test ## {#hey .sort,class=fine,class=shell} Doesn't matter</h2>
+//= = = = = = = = = = = = = = = = = = = = = = = =//
diff --git a/parser/atx_heading.go b/parser/atx_heading.go
index a631e0b..2526088 100644
--- a/parser/atx_heading.go
+++ b/parser/atx_heading.go
@@ -126,7 +126,8 @@ func (b *atxHeadingParser) Open(parent ast.Node, reader text.Reader, pc Context)
 		if closureClose > 0 {
 			reader.Advance(closureClose)
 			attrs, ok := ParseAttributes(reader)
-			parsed = ok
+			rest, _ := reader.PeekLine()
+			parsed = ok && util.IsBlank(rest)
 			if parsed {
 				for _, attr := range attrs {
 					node.SetAttribute(attr.Name, attr.Value)