diff --git a/patterns.js b/patterns.js
index 0744a7b..1acec80 100644
--- a/patterns.js
+++ b/patterns.js
@@ -296,7 +296,8 @@ module.exports = options => {
         token.nesting = 0;
         let content = tokens[i + 1].content;
         let start = content.lastIndexOf(options.leftDelimiter);
-        token.attrs = utils.getAttrs(content, start, options);
+        let attrs = utils.getAttrs(content, start, options);
+        utils.addAttrs(attrs, token);
         token.markup = content;
         tokens.splice(i + 1, 2);
       }
diff --git a/test.js b/test.js
index 5589436..bffdae9 100644
--- a/test.js
+++ b/test.js
@@ -389,6 +389,12 @@ function describeTestsWithOptions(options, postText) {
       expected = '<p class="someclass" attr="allowed">text</p>\n';
       assert.equal(md.render(replaceDelimiters(src, options)), expected);
     });
+
+    it(replaceDelimiters('should support multiple classes for <hr>', options), () => {
+      src = '--- {.a .b}';
+      expected = '<hr class="a b">\n';
+      assert.equal(md.render(replaceDelimiters(src, options)), expected);
+    });
   });
 }